Submitted By:            DJ Lucas <dj@linuxfromscratch.org>
                         based on previous patches submitted
                         by Armin K and Fernando de Oliveira
Date:                    2020-10-16
Initial Package Version: 19.0.4
Upstream Status:         Not applicable.
Origin:                  Self.
Description:             This patch adds two OpenGL demos, glxinfo and
                         glxgears and respective man pages.

diff -Naurp mesa-20.2.1-orig/src/glx/meson.build mesa-20.2.1/src/glx/meson.build
--- mesa-20.2.1-orig/src/glx/meson.build	2020-10-14 12:19:10.623185200 -0500
+++ mesa-20.2.1/src/glx/meson.build	2020-10-15 23:06:45.823362439 -0500
@@ -165,6 +165,8 @@ libgl = shared_library(
   install : true,
 )
 
+subdir('xdemos')
+
 if with_tests
   subdir('tests')
 endif
diff -Naurp mesa-20.2.1-orig/src/glx/xdemos/glinfo_common.c mesa-20.2.1/src/glx/xdemos/glinfo_common.c
--- mesa-20.2.1-orig/src/glx/xdemos/glinfo_common.c	1969-12-31 18:00:00.000000000 -0600
+++ mesa-20.2.1/src/glx/xdemos/glinfo_common.c	2020-10-15 23:06:45.826695773 -0500
@@ -0,0 +1,800 @@
+/*
+ * Copyright (C) 1999-2014  Brian Paul   All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <assert.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "glinfo_common.h"
+
+#ifdef _WIN32
+#define snprintf _snprintf
+#endif
+
+
+/**
+ * Return the GL enum name for a numeric value.
+ * We really only care about the compressed texture formats for now.
+ */
+static const char *
+enum_name(GLenum val)
+{
+   static const struct {
+      const char *name;
+      GLenum val;
+   } enums [] = {
+      { "GL_COMPRESSED_ALPHA", 0x84E9 },
+      { "GL_COMPRESSED_LUMINANCE", 0x84EA },
+      { "GL_COMPRESSED_LUMINANCE_ALPHA", 0x84EB },
+      { "GL_COMPRESSED_INTENSITY", 0x84EC },
+      { "GL_COMPRESSED_RGB", 0x84ED },
+      { "GL_COMPRESSED_RGBA", 0x84EE },
+      { "GL_COMPRESSED_TEXTURE_FORMATS", 0x86A3 },
+      { "GL_COMPRESSED_RGB", 0x84ED },
+      { "GL_COMPRESSED_RGBA", 0x84EE },
+      { "GL_COMPRESSED_TEXTURE_FORMATS", 0x86A3 },
+      { "GL_COMPRESSED_ALPHA", 0x84E9 },
+      { "GL_COMPRESSED_LUMINANCE", 0x84EA },
+      { "GL_COMPRESSED_LUMINANCE_ALPHA", 0x84EB },
+      { "GL_COMPRESSED_INTENSITY", 0x84EC },
+      { "GL_COMPRESSED_SRGB", 0x8C48 },
+      { "GL_COMPRESSED_SRGB_ALPHA", 0x8C49 },
+      { "GL_COMPRESSED_SLUMINANCE", 0x8C4A },
+      { "GL_COMPRESSED_SLUMINANCE_ALPHA", 0x8C4B },
+      { "GL_COMPRESSED_RED", 0x8225 },
+      { "GL_COMPRESSED_RG", 0x8226 },
+      { "GL_COMPRESSED_RED_RGTC1", 0x8DBB },
+      { "GL_COMPRESSED_SIGNED_RED_RGTC1", 0x8DBC },
+      { "GL_COMPRESSED_RG_RGTC2", 0x8DBD },
+      { "GL_COMPRESSED_SIGNED_RG_RGTC2", 0x8DBE },
+      { "GL_COMPRESSED_RGB8_ETC2", 0x9274 },
+      { "GL_COMPRESSED_SRGB8_ETC2", 0x9275 },
+      { "GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2", 0x9276 },
+      { "GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2", 0x9277 },
+      { "GL_COMPRESSED_RGBA8_ETC2_EAC", 0x9278 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC", 0x9279 },
+      { "GL_COMPRESSED_R11_EAC", 0x9270 },
+      { "GL_COMPRESSED_SIGNED_R11_EAC", 0x9271 },
+      { "GL_COMPRESSED_RG11_EAC", 0x9272 },
+      { "GL_COMPRESSED_SIGNED_RG11_EAC", 0x9273 },
+      { "GL_COMPRESSED_ALPHA_ARB", 0x84E9 },
+      { "GL_COMPRESSED_LUMINANCE_ARB", 0x84EA },
+      { "GL_COMPRESSED_LUMINANCE_ALPHA_ARB", 0x84EB },
+      { "GL_COMPRESSED_INTENSITY_ARB", 0x84EC },
+      { "GL_COMPRESSED_RGB_ARB", 0x84ED },
+      { "GL_COMPRESSED_RGBA_ARB", 0x84EE },
+      { "GL_COMPRESSED_TEXTURE_FORMATS_ARB", 0x86A3 },
+      { "GL_COMPRESSED_RGBA_BPTC_UNORM_ARB", 0x8E8C },
+      { "GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB", 0x8E8D },
+      { "GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB", 0x8E8E },
+      { "GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB", 0x8E8F },
+      { "GL_COMPRESSED_RGBA_ASTC_4x4_KHR", 0x93B0 },
+      { "GL_COMPRESSED_RGBA_ASTC_5x4_KHR", 0x93B1 },
+      { "GL_COMPRESSED_RGBA_ASTC_5x5_KHR", 0x93B2 },
+      { "GL_COMPRESSED_RGBA_ASTC_6x5_KHR", 0x93B3 },
+      { "GL_COMPRESSED_RGBA_ASTC_6x6_KHR", 0x93B4 },
+      { "GL_COMPRESSED_RGBA_ASTC_8x5_KHR", 0x93B5 },
+      { "GL_COMPRESSED_RGBA_ASTC_8x6_KHR", 0x93B6 },
+      { "GL_COMPRESSED_RGBA_ASTC_8x8_KHR", 0x93B7 },
+      { "GL_COMPRESSED_RGBA_ASTC_10x5_KHR", 0x93B8 },
+      { "GL_COMPRESSED_RGBA_ASTC_10x6_KHR", 0x93B9 },
+      { "GL_COMPRESSED_RGBA_ASTC_10x8_KHR", 0x93BA },
+      { "GL_COMPRESSED_RGBA_ASTC_10x10_KHR", 0x93BB },
+      { "GL_COMPRESSED_RGBA_ASTC_12x10_KHR", 0x93BC },
+      { "GL_COMPRESSED_RGBA_ASTC_12x12_KHR", 0x93BD },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR", 0x93D0 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR", 0x93D1 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR", 0x93D2 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR", 0x93D3 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR", 0x93D4 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR", 0x93D5 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR", 0x93D6 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR", 0x93D7 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR", 0x93D8 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR", 0x93D9 },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR", 0x93DA },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR", 0x93DB },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR", 0x93DC },
+      { "GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR", 0x93DD },
+      { "GL_COMPRESSED_RGB_FXT1_3DFX", 0x86B0 },
+      { "GL_COMPRESSED_RGBA_FXT1_3DFX", 0x86B1 },
+      { "GL_COMPRESSED_LUMINANCE_LATC1_EXT", 0x8C70 },
+      { "GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT", 0x8C71 },
+      { "GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT", 0x8C72 },
+      { "GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT", 0x8C73 },
+      { "GL_COMPRESSED_RED_RGTC1_EXT", 0x8DBB },
+      { "GL_COMPRESSED_SIGNED_RED_RGTC1_EXT", 0x8DBC },
+      { "GL_COMPRESSED_RED_GREEN_RGTC2_EXT", 0x8DBD },
+      { "GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT", 0x8DBE },
+      { "GL_COMPRESSED_RGB_S3TC_DXT1_EXT", 0x83F0 },
+      { "GL_COMPRESSED_RGBA_S3TC_DXT1_EXT", 0x83F1 },
+      { "GL_COMPRESSED_RGBA_S3TC_DXT3_EXT", 0x83F2 },
+      { "GL_COMPRESSED_RGBA_S3TC_DXT5_EXT", 0x83F3 },
+      { "GL_COMPRESSED_SRGB_EXT", 0x8C48 },
+      { "GL_COMPRESSED_SRGB_ALPHA_EXT", 0x8C49 },
+      { "GL_COMPRESSED_SLUMINANCE_EXT", 0x8C4A },
+      { "GL_COMPRESSED_SLUMINANCE_ALPHA_EXT", 0x8C4B },
+      { "GL_COMPRESSED_SRGB_S3TC_DXT1_EXT", 0x8C4C },
+      { "GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT", 0x8C4D },
+      { "GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT", 0x8C4E },
+      { "GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT", 0x8C4F },
+      { "GL_PALETTE4_RGB8_OES", 0x8B90 },
+      { "GL_PALETTE4_RGBA8_OES", 0x8B91 },
+      { "GL_PALETTE4_R5_G6_B5_OES", 0x8B92 },
+      { "GL_PALETTE4_RGBA4_OES", 0x8B93 },
+      { "GL_PALETTE4_RGB5_A1_OES", 0x8B94 },
+      { "GL_PALETTE8_RGB8_OES", 0x8B95 },
+      { "GL_PALETTE8_RGBA8_OES", 0x8B96 },
+      { "GL_PALETTE8_R5_G6_B5_OES", 0x8B97 },
+      { "GL_PALETTE8_RGBA4_OES", 0x8B98 },
+      { "GL_PALETTE8_RGB5_A1_OES", 0x8B99 }
+   };
+   const int n = sizeof(enums) / sizeof(enums[0]);
+   static char buffer[100];
+   int i;
+   for (i = 0; i < n; i++) {
+      if (enums[i].val == val) {
+         return enums[i].name;
+      }
+   }
+   /* enum val not found, just print hexadecimal value into static buffer */
+   snprintf(buffer, sizeof(buffer), "0x%x", val);
+   return buffer;
+}
+
+
+/*
+ * qsort callback for string comparison.
+ */
+static int
+compare_string_ptr(const void *p1, const void *p2)
+{
+   return strcmp(* (char * const *) p1, * (char * const *) p2);
+}
+
+/*
+ * Print a list of extensions, with word-wrapping.
+ */
+void
+print_extension_list(const char *ext, GLboolean singleLine)
+{
+   char **extensions;
+   int num_extensions;
+   const char *indentString = "    ";
+   const int indent = 4;
+   const int max = 79;
+   int width, i, j, k;
+
+   if (!ext || !ext[0])
+      return;
+
+   /* count the number of extensions, ignoring successive spaces */
+   num_extensions = 0;
+   j = 1;
+   do {
+      if ((ext[j] == ' ' || ext[j] == 0) && ext[j - 1] != ' ') {
+         ++num_extensions;
+      }
+   } while(ext[j++]);
+
+   /* copy individual extensions to an array */
+   extensions = malloc(num_extensions * sizeof *extensions);
+   if (!extensions) {
+      fprintf(stderr, "Error: malloc() failed\n");
+      exit(1);
+   }
+   i = j = k = 0;
+   while (1) {
+      if (ext[j] == ' ' || ext[j] == 0) {
+         /* found end of an extension name */
+         const int len = j - i;
+
+         if (len) {
+            assert(k < num_extensions);
+
+            extensions[k] = malloc(len + 1);
+            if (!extensions[k]) {
+               fprintf(stderr, "Error: malloc() failed\n");
+               exit(1);
+            }
+
+            memcpy(extensions[k], ext + i, len);
+            extensions[k][len] = 0;
+
+            ++k;
+         };
+
+         i += len + 1;
+
+         if (ext[j] == 0) {
+            break;
+         }
+      }
+      j++;
+   }
+   assert(k == num_extensions);
+
+   /* sort extensions alphabetically */
+   qsort(extensions, num_extensions, sizeof extensions[0], compare_string_ptr);
+
+   /* print the extensions */
+   width = indent;
+   printf("%s", indentString);
+   for (k = 0; k < num_extensions; ++k) {
+      const int len = strlen(extensions[k]);
+      if ((!singleLine) && (width + len > max)) {
+         /* start a new line */
+         printf("\n");
+         width = indent;
+         printf("%s", indentString);
+      }
+      /* print the extension name */
+      printf("%s", extensions[k]);
+
+      /* either we're all done, or we'll continue with next extension */
+      width += len + 1;
+
+      if (singleLine) {
+         printf("\n");
+         width = indent;
+         printf("%s", indentString);
+      }
+      else if (k < (num_extensions -1)) {
+         printf(", ");
+         width += 2;
+      }
+   }
+   printf("\n");
+
+   for (k = 0; k < num_extensions; ++k) {
+      free(extensions[k]);
+   }
+   free(extensions);
+}
+
+
+
+
+/**
+ * Get list of OpenGL extensions using core profile's glGetStringi().
+ */
+char *
+build_core_profile_extension_list(const struct ext_functions *extfuncs)
+{
+   GLint i, n, totalLen;
+   char *buffer;
+
+   glGetIntegerv(GL_NUM_EXTENSIONS, &n);
+
+   /* compute totalLen */
+   totalLen = 0;
+   for (i = 0; i < n; i++) {
+      const char *ext = (const char *) extfuncs->GetStringi(GL_EXTENSIONS, i);
+      if (ext)
+          totalLen += strlen(ext) + 1; /* plus a space */
+   }
+
+   if (!totalLen)
+     return NULL;
+
+   buffer = malloc(totalLen + 1);
+   if (buffer) {
+      int pos = 0;
+      for (i = 0; i < n; i++) {
+         const char *ext = (const char *) extfuncs->GetStringi(GL_EXTENSIONS, i);
+         strcpy(buffer + pos, ext);
+         pos += strlen(ext);
+         buffer[pos++] = ' ';
+      }
+      buffer[pos] = '\0';
+   }
+   return buffer;
+}
+
+
+/** Is extension 'ext' supported? */
+GLboolean
+extension_supported(const char *ext, const char *extensionsList)
+{
+   while (1) {
+      const char *p = strstr(extensionsList, ext);
+      if (p) {
+         /* check that next char is a space or end of string */
+         int extLen = strlen(ext);
+         if (p[extLen] == 0 || p[extLen] == ' ') {
+            return 1;
+         }
+         else {
+            /* We found a superset string, keep looking */
+            extensionsList += extLen;
+         }
+      }
+      else {
+         break;
+      }
+   }
+   return 0;
+}
+
+
+/**
+ * Is verNum >= verString?
+ * \param verString  such as "2.1", "3.0", etc.
+ * \param verNum  such as 20, 21, 30, 31, 32, etc.
+ */
+static GLboolean
+version_supported(const char *verString, int verNum)
+{
+   int v;
+
+   if (!verString ||
+       !isdigit(verString[0]) ||
+       verString[1] != '.' ||
+       !isdigit(verString[2])) {
+      return GL_FALSE;
+   }
+
+   v = (verString[0] - '0') * 10 + (verString[2] - '0');
+
+   return verNum >= v;
+}
+
+
+struct token_name
+{
+   GLenum token;
+   const char *name;
+};
+
+
+static void
+print_shader_limit_list(const struct token_name *lim)
+{
+   GLint max[1];
+   unsigned i;
+
+   for (i = 0; lim[i].token; i++) {
+      glGetIntegerv(lim[i].token, max);
+      if (glGetError() == GL_NO_ERROR) {
+	 printf("        %s = %d\n", lim[i].name, max[0]);
+      }
+   }
+}
+
+
+/**
+ * Print interesting limits for vertex/fragment shaders.
+ */
+static void
+print_shader_limits(GLenum target)
+{
+   static const struct token_name vertex_limits[] = {
+      { GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB, "GL_MAX_VERTEX_UNIFORM_COMPONENTS_ARB" },
+      { GL_MAX_VARYING_FLOATS_ARB, "GL_MAX_VARYING_FLOATS_ARB" },
+      { GL_MAX_VERTEX_ATTRIBS_ARB, "GL_MAX_VERTEX_ATTRIBS_ARB" },
+      { GL_MAX_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_TEXTURE_IMAGE_UNITS_ARB" },
+      { GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB" },
+      { GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS_ARB" },
+      { GL_MAX_TEXTURE_COORDS_ARB, "GL_MAX_TEXTURE_COORDS_ARB" },
+      { GL_MAX_VERTEX_OUTPUT_COMPONENTS  , "GL_MAX_VERTEX_OUTPUT_COMPONENTS  " },
+      { (GLenum) 0, NULL }
+   };
+   static const struct token_name fragment_limits[] = {
+      { GL_MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB, "GL_MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB" },
+      { GL_MAX_TEXTURE_COORDS_ARB, "GL_MAX_TEXTURE_COORDS_ARB" },
+      { GL_MAX_TEXTURE_IMAGE_UNITS_ARB, "GL_MAX_TEXTURE_IMAGE_UNITS_ARB" },
+      { GL_MAX_FRAGMENT_INPUT_COMPONENTS , "GL_MAX_FRAGMENT_INPUT_COMPONENTS " },
+      { (GLenum) 0, NULL }
+   };
+   static const struct token_name geometry_limits[] = {
+      { GL_MAX_GEOMETRY_UNIFORM_COMPONENTS, "GL_MAX_GEOMETRY_UNIFORM_COMPONENTS" },
+      { GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS, "GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS" },
+      { GL_MAX_GEOMETRY_OUTPUT_VERTICES  , "GL_MAX_GEOMETRY_OUTPUT_VERTICES  " },
+      { GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS, "GL_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS" },
+      { GL_MAX_GEOMETRY_INPUT_COMPONENTS , "GL_MAX_GEOMETRY_INPUT_COMPONENTS " },
+      { GL_MAX_GEOMETRY_OUTPUT_COMPONENTS, "GL_MAX_GEOMETRY_OUTPUT_COMPONENTS" },
+      { (GLenum) 0, NULL }
+   };
+
+   switch (target) {
+   case GL_VERTEX_SHADER:
+      printf("    GL_VERTEX_SHADER_ARB:\n");
+      print_shader_limit_list(vertex_limits);
+      break;
+
+   case GL_FRAGMENT_SHADER:
+      printf("    GL_FRAGMENT_SHADER_ARB:\n");
+      print_shader_limit_list(fragment_limits);
+      break;
+
+   case GL_GEOMETRY_SHADER:
+      printf("    GL_GEOMETRY_SHADER:\n");
+      print_shader_limit_list(geometry_limits);
+      break;
+   }
+}
+
+
+/**
+ * Print interesting limits for vertex/fragment programs.
+ */
+static void
+print_program_limits(GLenum target, 
+                     const struct ext_functions *extfuncs)
+{
+#if defined(GL_ARB_vertex_program) || defined(GL_ARB_fragment_program)
+   struct token_name {
+      GLenum token;
+      const char *name;
+   };
+   static const struct token_name common_limits[] = {
+      { GL_MAX_PROGRAM_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_INSTRUCTIONS_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_INSTRUCTIONS_ARB" },
+      { GL_MAX_PROGRAM_TEMPORARIES_ARB, "GL_MAX_PROGRAM_TEMPORARIES_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_TEMPORARIES_ARB, "GL_MAX_PROGRAM_NATIVE_TEMPORARIES_ARB" },
+      { GL_MAX_PROGRAM_PARAMETERS_ARB, "GL_MAX_PROGRAM_PARAMETERS_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_PARAMETERS_ARB, "GL_MAX_PROGRAM_NATIVE_PARAMETERS_ARB" },
+      { GL_MAX_PROGRAM_ATTRIBS_ARB, "GL_MAX_PROGRAM_ATTRIBS_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB, "GL_MAX_PROGRAM_NATIVE_ATTRIBS_ARB" },
+      { GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB, "GL_MAX_PROGRAM_ADDRESS_REGISTERS_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_ADDRESS_REGISTERS_ARB, "GL_MAX_PROGRAM_NATIVE_ADDRESS_REGISTERS_ARB" },
+      { GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB, "GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB" },
+      { GL_MAX_PROGRAM_ENV_PARAMETERS_ARB, "GL_MAX_PROGRAM_ENV_PARAMETERS_ARB" },
+      { (GLenum) 0, NULL }
+   };
+   static const struct token_name fragment_limits[] = {
+      { GL_MAX_PROGRAM_ALU_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_ALU_INSTRUCTIONS_ARB" },
+      { GL_MAX_PROGRAM_TEX_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_TEX_INSTRUCTIONS_ARB" },
+      { GL_MAX_PROGRAM_TEX_INDIRECTIONS_ARB, "GL_MAX_PROGRAM_TEX_INDIRECTIONS_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_TEX_INSTRUCTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_TEX_INSTRUCTIONS_ARB" },
+      { GL_MAX_PROGRAM_NATIVE_TEX_INDIRECTIONS_ARB, "GL_MAX_PROGRAM_NATIVE_TEX_INDIRECTIONS_ARB" },
+      { (GLenum) 0, NULL }
+   };
+
+   GLint max[1];
+   int i;
+
+   if (target == GL_VERTEX_PROGRAM_ARB) {
+      printf("    GL_VERTEX_PROGRAM_ARB:\n");
+   }
+   else if (target == GL_FRAGMENT_PROGRAM_ARB) {
+      printf("    GL_FRAGMENT_PROGRAM_ARB:\n");
+   }
+   else {
+      return; /* something's wrong */
+   }
+
+   for (i = 0; common_limits[i].token; i++) {
+      extfuncs->GetProgramivARB(target, common_limits[i].token, max);
+      if (glGetError() == GL_NO_ERROR) {
+         printf("        %s = %d\n", common_limits[i].name, max[0]);
+      }
+   }
+   if (target == GL_FRAGMENT_PROGRAM_ARB) {
+      for (i = 0; fragment_limits[i].token; i++) {
+         extfuncs->GetProgramivARB(target, fragment_limits[i].token, max);
+         if (glGetError() == GL_NO_ERROR) {
+            printf("        %s = %d\n", fragment_limits[i].name, max[0]);
+         }
+      }
+   }
+#endif /* GL_ARB_vertex_program / GL_ARB_fragment_program */
+}
+
+
+/**
+ * Print interesting OpenGL implementation limits.
+ * \param version  20, 21, 30, 31, 32, etc.
+ */
+void
+print_limits(const char *extensions, const char *oglstring, int version,
+             const struct ext_functions *extfuncs)
+{
+   struct token_name {
+      GLuint count;
+      GLenum token;
+      const char *name;
+      const char *extension; /* NULL or GL extension name or version string */
+   };
+   static const struct token_name limits[] = {
+      { 1, GL_MAX_ATTRIB_STACK_DEPTH, "GL_MAX_ATTRIB_STACK_DEPTH", NULL },
+      { 1, GL_MAX_CLIENT_ATTRIB_STACK_DEPTH, "GL_MAX_CLIENT_ATTRIB_STACK_DEPTH", NULL },
+      { 1, GL_MAX_CLIP_PLANES, "GL_MAX_CLIP_PLANES", NULL },
+      { 1, GL_MAX_COLOR_MATRIX_STACK_DEPTH, "GL_MAX_COLOR_MATRIX_STACK_DEPTH", "GL_ARB_imaging" },
+      { 1, GL_MAX_ELEMENTS_VERTICES, "GL_MAX_ELEMENTS_VERTICES", NULL },
+      { 1, GL_MAX_ELEMENTS_INDICES, "GL_MAX_ELEMENTS_INDICES", NULL },
+      { 1, GL_MAX_EVAL_ORDER, "GL_MAX_EVAL_ORDER", NULL },
+      { 1, GL_MAX_LIGHTS, "GL_MAX_LIGHTS", NULL },
+      { 1, GL_MAX_LIST_NESTING, "GL_MAX_LIST_NESTING", NULL },
+      { 1, GL_MAX_MODELVIEW_STACK_DEPTH, "GL_MAX_MODELVIEW_STACK_DEPTH", NULL },
+      { 1, GL_MAX_NAME_STACK_DEPTH, "GL_MAX_NAME_STACK_DEPTH", NULL },
+      { 1, GL_MAX_PIXEL_MAP_TABLE, "GL_MAX_PIXEL_MAP_TABLE", NULL },
+      { 1, GL_MAX_PROJECTION_STACK_DEPTH, "GL_MAX_PROJECTION_STACK_DEPTH", NULL },
+      { 1, GL_MAX_TEXTURE_STACK_DEPTH, "GL_MAX_TEXTURE_STACK_DEPTH", NULL },
+      { 1, GL_MAX_TEXTURE_SIZE, "GL_MAX_TEXTURE_SIZE", NULL },
+      { 1, GL_MAX_3D_TEXTURE_SIZE, "GL_MAX_3D_TEXTURE_SIZE", NULL },
+#if defined(GL_EXT_texture_array)
+      { 1, GL_MAX_ARRAY_TEXTURE_LAYERS_EXT, "GL_MAX_ARRAY_TEXTURE_LAYERS", "GL_EXT_texture_array" },
+#endif
+      { 2, GL_MAX_VIEWPORT_DIMS, "GL_MAX_VIEWPORT_DIMS", NULL },
+      { 2, GL_ALIASED_LINE_WIDTH_RANGE, "GL_ALIASED_LINE_WIDTH_RANGE", NULL },
+      { 2, GL_SMOOTH_LINE_WIDTH_RANGE, "GL_SMOOTH_LINE_WIDTH_RANGE", NULL },
+      { 2, GL_ALIASED_POINT_SIZE_RANGE, "GL_ALIASED_POINT_SIZE_RANGE", NULL },
+      { 2, GL_SMOOTH_POINT_SIZE_RANGE, "GL_SMOOTH_POINT_SIZE_RANGE", NULL },
+#if defined(GL_ARB_texture_cube_map)
+      { 1, GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB, "GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB", "GL_ARB_texture_cube_map" },
+#endif
+#if defined(GL_NV_texture_rectangle)
+      { 1, GL_MAX_RECTANGLE_TEXTURE_SIZE_NV, "GL_MAX_RECTANGLE_TEXTURE_SIZE_NV", "GL_NV_texture_rectangle" },
+#endif
+#if defined(GL_ARB_multitexture)
+      { 1, GL_MAX_TEXTURE_UNITS_ARB, "GL_MAX_TEXTURE_UNITS_ARB", "GL_ARB_multitexture" },
+#endif
+#if defined(GL_EXT_texture_lod_bias)
+      { 1, GL_MAX_TEXTURE_LOD_BIAS_EXT, "GL_MAX_TEXTURE_LOD_BIAS_EXT", "GL_EXT_texture_lod_bias" },
+#endif
+#if defined(GL_EXT_texture_filter_anisotropic)
+      { 1, GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, "GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT", "GL_EXT_texture_filter_anisotropic" },
+#endif
+#if defined(GL_ARB_draw_buffers)
+      { 1, GL_MAX_DRAW_BUFFERS_ARB, "GL_MAX_DRAW_BUFFERS_ARB", "GL_ARB_draw_buffers" },
+#endif
+#if defined(GL_ARB_blend_func_extended)
+      { 1, GL_MAX_DUAL_SOURCE_DRAW_BUFFERS, "GL_MAX_DUAL_SOURCE_DRAW_BUFFERS", "GL_ARB_blend_func_extended" },
+#endif
+#if defined (GL_ARB_framebuffer_object)
+      { 1, GL_MAX_RENDERBUFFER_SIZE, "GL_MAX_RENDERBUFFER_SIZE", "GL_ARB_framebuffer_object" },
+      { 1, GL_MAX_COLOR_ATTACHMENTS, "GL_MAX_COLOR_ATTACHMENTS", "GL_ARB_framebuffer_object" },
+      { 1, GL_MAX_SAMPLES, "GL_MAX_SAMPLES", "GL_ARB_framebuffer_object" },
+#endif
+#if defined (GL_EXT_transform_feedback)
+     { 1, GL_MAX_TRANSFORM_FEEDBACK_BUFFERS, "GL_MAX_TRANSFORM_FEEDBACK_BUFFERS", "GL_EXT_transform_feedback" },
+     { 1, GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT, "GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS", "GL_EXT_transform_feedback" },
+     { 1, GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS_EXT, "GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS", "GL_EXT_transform_feedback", },
+     { 1, GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS_EXT, "GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS", "GL_EXT_transform_feedback" },
+#endif
+#if defined (GL_ARB_texture_buffer_object)
+      { 1, GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT, "GL_TEXTURE_BUFFER_OFFSET_ALIGNMENT", "GL_ARB_texture_buffer_object" },
+      { 1, GL_MAX_TEXTURE_BUFFER_SIZE, "GL_MAX_TEXTURE_BUFFER_SIZE", "GL_ARB_texture_buffer_object" },
+#endif
+#if defined (GL_ARB_texture_multisample)
+      { 1, GL_MAX_COLOR_TEXTURE_SAMPLES, "GL_MAX_COLOR_TEXTURE_SAMPLES", "GL_ARB_texture_multisample" },
+      { 1, GL_MAX_DEPTH_TEXTURE_SAMPLES, "GL_MAX_DEPTH_TEXTURE_SAMPLES", "GL_ARB_texture_multisample" },
+      { 1, GL_MAX_INTEGER_SAMPLES, "GL_MAX_INTEGER_SAMPLES", "GL_ARB_texture_multisample" },
+#endif
+#if defined (GL_ARB_uniform_buffer_object)
+      { 1, GL_MAX_VERTEX_UNIFORM_BLOCKS, "GL_MAX_VERTEX_UNIFORM_BLOCKS", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_FRAGMENT_UNIFORM_BLOCKS, "GL_MAX_FRAGMENT_UNIFORM_BLOCKS", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_GEOMETRY_UNIFORM_BLOCKS, "GL_MAX_GEOMETRY_UNIFORM_BLOCKS" , "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_COMBINED_UNIFORM_BLOCKS, "GL_MAX_COMBINED_UNIFORM_BLOCKS", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_UNIFORM_BUFFER_BINDINGS, "GL_MAX_UNIFORM_BUFFER_BINDINGS", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_UNIFORM_BLOCK_SIZE, "GL_MAX_UNIFORM_BLOCK_SIZE", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS, "GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS, "GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS, "GL_MAX_COMBINED_GEOMETRY_UNIFORM_COMPONENTS", "GL_ARB_uniform_buffer_object" },
+      { 1, GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, "GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT", "GL_ARB_uniform_buffer_object" },
+#endif
+#if defined (GL_ARB_vertex_attrib_binding)
+      { 1, GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET, "GL_MAX_VERTEX_ATTRIB_RELATIVE_OFFSET", "GL_ARB_vertex_attrib_binding" },
+      { 1, GL_MAX_VERTEX_ATTRIB_BINDINGS, "GL_MAX_VERTEX_ATTRIB_BINDINGS", "GL_ARB_vertex_attrib_binding" },
+#endif
+#if defined(GL_VERSION_4_4)
+      { 1, GL_MAX_VERTEX_ATTRIB_STRIDE, "GL_MAX_VERTEX_ATTRIB_STRIDE", "4.4" },
+#endif
+      { 0, (GLenum) 0, NULL, NULL }
+   };
+   GLint i, max[2];
+
+   printf("%s limits:\n", oglstring);
+   for (i = 0; limits[i].count; i++) {
+      if (!limits[i].extension ||
+          version_supported(limits[i].extension, version) ||
+          extension_supported(limits[i].extension, extensions)) {
+         glGetIntegerv(limits[i].token, max);
+         if (glGetError() == GL_NO_ERROR) {
+            if (limits[i].count == 1)
+               printf("    %s = %d\n", limits[i].name, max[0]);
+            else /* XXX fix if we ever query something with more than 2 values */
+               printf("    %s = %d, %d\n", limits[i].name, max[0], max[1]);
+         }
+      }
+   }
+
+   /* these don't fit into the above mechanism, unfortunately */
+   if (extension_supported("GL_ARB_imaging", extensions)) {
+      extfuncs->GetConvolutionParameteriv(GL_CONVOLUTION_2D,
+                                          GL_MAX_CONVOLUTION_WIDTH, max);
+      extfuncs->GetConvolutionParameteriv(GL_CONVOLUTION_2D,
+                                          GL_MAX_CONVOLUTION_HEIGHT, max+1);
+      printf("    GL_MAX_CONVOLUTION_WIDTH/HEIGHT = %d, %d\n", max[0], max[1]);
+   }
+
+   if (extension_supported("GL_ARB_texture_compression", extensions)) {
+      GLint i, n;
+      GLint *formats;
+      glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS, &n);
+      printf("    GL_NUM_COMPRESSED_TEXTURE_FORMATS = %d\n", n);
+      formats = (GLint *) malloc(n * sizeof(GLint));
+      glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS, formats);
+      for (i = 0; i < n; i++) {
+         printf("        %s\n", enum_name(formats[i]));
+      }
+      free(formats);
+   }
+#if defined(GL_ARB_vertex_program)
+   if (extension_supported("GL_ARB_vertex_program", extensions)) {
+      print_program_limits(GL_VERTEX_PROGRAM_ARB, extfuncs);
+   }
+#endif
+#if defined(GL_ARB_fragment_program)
+   if (extension_supported("GL_ARB_fragment_program", extensions)) {
+      print_program_limits(GL_FRAGMENT_PROGRAM_ARB, extfuncs);
+   }
+#endif
+   if (extension_supported("GL_ARB_vertex_shader", extensions)) {
+      print_shader_limits(GL_VERTEX_SHADER_ARB);
+   }
+   if (extension_supported("GL_ARB_fragment_shader", extensions)) {
+      print_shader_limits(GL_FRAGMENT_SHADER_ARB);
+   }
+   if (version >= 32) {
+      print_shader_limits(GL_GEOMETRY_SHADER);
+   }
+}
+
+
+
+/**
+ * Return string representation for bits in a bitmask.
+ */
+const char *
+bitmask_to_string(const struct bit_info bits[], int numBits, int mask)
+{
+   static char buffer[256], *p;
+   int i;
+
+   strcpy(buffer, "(none)");
+   p = buffer;
+   for (i = 0; i < numBits; i++) {
+      if (mask & bits[i].bit) {
+         if (p > buffer)
+            *p++ = ',';
+         strcpy(p, bits[i].name);
+         p += strlen(bits[i].name);
+      }
+   }
+
+   return buffer;
+}
+
+/**
+ * Return string representation for the bitmask returned by
+ * GL_CONTEXT_PROFILE_MASK (OpenGL 3.2 or later).
+ */
+const char *
+profile_mask_string(int mask)
+{
+   const static struct bit_info bits[] = {
+#ifdef GL_CONTEXT_CORE_PROFILE_BIT
+      { GL_CONTEXT_CORE_PROFILE_BIT, "core profile"},
+#endif
+#ifdef GL_CONTEXT_COMPATIBILITY_PROFILE_BIT
+      { GL_CONTEXT_COMPATIBILITY_PROFILE_BIT, "compatibility profile" }
+#endif
+   };
+
+   return bitmask_to_string(bits, ELEMENTS(bits), mask);
+}
+
+
+/**
+ * Return string representation for the bitmask returned by
+ * GL_CONTEXT_FLAGS (OpenGL 3.0 or later).
+ */
+const char *
+context_flags_string(int mask)
+{
+   const static struct bit_info bits[] = {
+#ifdef GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT
+      { GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT, "forward-compatible" },
+#endif
+#ifdef GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB
+      { GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB, "robust-access" },
+#endif
+   };
+
+   return bitmask_to_string(bits, ELEMENTS(bits), mask);
+}
+
+
+static void
+usage(void)
+{
+#ifdef _WIN32
+   printf("Usage: wglinfo [-v] [-t] [-h] [-b] [-l] [-s]\n");
+#else
+   printf("Usage: glxinfo [-v] [-t] [-h] [-b] [-l] [-s] [-i] [-display <dname>]\n");
+   printf("\t-display <dname>: Print GLX visuals on specified server.\n");
+   printf("\t-i: Force an indirect rendering context.\n");
+#endif
+   printf("\t-B: brief output, print only the basics.\n");
+   printf("\t-v: Print visuals info in verbose form.\n");
+   printf("\t-t: Print verbose table.\n");
+   printf("\t-h: This information.\n");
+   printf("\t-b: Find the 'best' visual and print its number.\n");
+   printf("\t-l: Print interesting OpenGL limits.\n");
+   printf("\t-s: Print a single extension per line.\n");
+}
+
+void
+parse_args(int argc, char *argv[], struct options *options)
+{
+   int i;
+
+   options->mode = Normal;
+   options->findBest = GL_FALSE;
+   options->limits = GL_FALSE;
+   options->singleLine = GL_FALSE;
+   options->displayName = NULL;
+   options->allowDirect = GL_TRUE;
+
+   for (i = 1; i < argc; i++) {
+#ifndef _WIN32
+      if (strcmp(argv[i], "-display") == 0 && i + 1 < argc) {
+         options->displayName = argv[i + 1];
+         i++;
+      }
+      else if (strcmp(argv[i], "-i") == 0) {
+         options->allowDirect = GL_FALSE;
+      }
+      else
+#endif
+      if (strcmp(argv[i], "-t") == 0) {
+         options->mode = Wide;
+      }
+      else if (strcmp(argv[i], "-v") == 0) {
+         options->mode = Verbose;
+      }
+      else if (strcmp(argv[i], "-B") == 0) {
+         options->mode = Brief;
+      }
+      else if (strcmp(argv[i], "-b") == 0) {
+         options->findBest = GL_TRUE;
+      }
+      else if (strcmp(argv[i], "-l") == 0) {
+         options->limits = GL_TRUE;
+      }
+      else if (strcmp(argv[i], "-h") == 0) {
+         usage();
+         exit(0);
+      }
+      else if(strcmp(argv[i], "-s") == 0) {
+         options->singleLine = GL_TRUE;
+      }
+      else {
+         printf("Unknown option `%s'\n", argv[i]);
+         usage();
+         exit(0);
+      }
+   }
+}
diff -Naurp mesa-20.2.1-orig/src/glx/xdemos/glinfo_common.h mesa-20.2.1/src/glx/xdemos/glinfo_common.h
--- mesa-20.2.1-orig/src/glx/xdemos/glinfo_common.h	1969-12-31 18:00:00.000000000 -0600
+++ mesa-20.2.1/src/glx/xdemos/glinfo_common.h	2020-10-15 23:06:45.826695773 -0500
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 1999-2014  Brian Paul   All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/**
+ * Common code shared by glxinfo and wglinfo.
+ */
+
+#ifndef GLINFO_COMMON_H
+#define GLINFO_COMMON_H
+
+
+#ifdef _WIN32
+/* GL/glext.h is not commonly available on Windows. */
+#include <GL/glew.h>
+#else
+#include <GL/gl.h>
+#include <GL/glext.h>
+#endif
+
+typedef void (APIENTRY * GETPROGRAMIVARBPROC) (GLenum target, GLenum pname, GLint *params);
+typedef const GLubyte *(APIENTRY * GETSTRINGIPROC) (GLenum name, GLuint index);
+typedef void (APIENTRY * GETCONVOLUTIONPARAMETERIVPROC) (GLenum target, GLenum pname, GLint *params);
+
+
+/**
+ * Ext functions needed in common code but must be provided by
+ * glxinfo or wglinfo.
+ */
+struct ext_functions
+{
+   GETPROGRAMIVARBPROC GetProgramivARB;
+   GETSTRINGIPROC GetStringi;
+   GETCONVOLUTIONPARAMETERIVPROC GetConvolutionParameteriv;
+};
+
+
+#define ELEMENTS(array) (sizeof(array) / sizeof(array[0]))
+
+
+struct bit_info
+{
+   int bit;
+   const char *name;
+};
+
+
+typedef enum
+{
+   Normal,
+   Wide,
+   Verbose,
+   Brief
+} InfoMode;
+
+
+struct options
+{
+   InfoMode mode;
+   GLboolean findBest;
+   GLboolean limits;
+   GLboolean singleLine;
+   /* GLX only */
+   char *displayName;
+   GLboolean allowDirect;
+};
+
+
+/** list of known OpenGL versions */
+static const struct { int major, minor; } gl_versions[] = {
+   {4, 5},
+   {4, 4},
+   {4, 3},
+   {4, 2},
+   {4, 1},
+   {4, 0},
+
+   {3, 3},
+   {3, 2},
+   {3, 1},
+   {3, 0},
+
+   {2, 1},
+   {2, 0},
+
+   {1, 5},
+   {1, 4},
+   {1, 3},
+   {1, 2},
+   {1, 1},
+   {1, 0},
+
+   {0, 0} /* end of list */
+};
+
+
+void
+print_extension_list(const char *ext, GLboolean singleLine);
+
+char *
+build_core_profile_extension_list(const struct ext_functions *extfuncs);
+
+GLboolean
+extension_supported(const char *ext, const char *extensionsList);
+
+void
+print_limits(const char *extensions, const char *oglstring, int version,
+             const struct ext_functions *extfuncs);
+
+const char *
+bitmask_to_string(const struct bit_info bits[], int numBits, int mask);
+
+const char *
+profile_mask_string(int mask);
+
+const char *
+context_flags_string(int mask);
+
+
+void
+parse_args(int argc, char *argv[], struct options *options);
+
+
+#endif /* GLINFO_COMMON_H */
diff -Naurp mesa-20.2.1-orig/src/glx/xdemos/glxgears.1 mesa-20.2.1/src/glx/xdemos/glxgears.1
--- mesa-20.2.1-orig/src/glx/xdemos/glxgears.1	1969-12-31 18:00:00.000000000 -0600
+++ mesa-20.2.1/src/glx/xdemos/glxgears.1	2020-10-15 23:06:45.826695773 -0500
@@ -0,0 +1,37 @@
+.TH glxgears 1 "2006-11-29"
+.SH NAME
+glxgears \- ``gears'' demo for GLX
+.SH SYNOPSIS
+.B glxgears
+.RI [ options ]
+.SH DESCRIPTION
+The \fIglxgears\fP program is a port of the ``gears'' demo to GLX. It displays
+a set of rotating gears and prints out the frame rate at regular intervals. It
+has become quite popular as basic benchmarking tool.
+.SH OPTIONS
+.TP 8
+.B \-display \fIdisplay\fP
+Specify which X display to run on.
+.TP 8
+.B \-stereo
+Use a stereo enabled GLX visual.
+.TP 8
+.B \-samples \fIN\fP
+Run in multisample mode with at least N samples.
+.TP 8
+.B \-fullscreen
+Run in fullscreen mode.
+.TP 8
+.B \-info
+Display OpenGL renderer information.
+.TP 8
+.B \-geometry \fIWxH+X+Y\fP
+Window geometry.
+.SH AUTHOR
+glxgears was written by Brian Paul <brian.paul@tungstengraphics.com>.
+.PP
+This manual page was written by Thierry Reding <thierry@gilfi.de>, for the
+Debian project and updated by Fernando de Oliveira <famobr at yahoo dot
+com dot br>, for the Linux From Scratch (LFS) project (but may be used by
+others).
+
diff -Naurp mesa-20.2.1-orig/src/glx/xdemos/glxgears.c mesa-20.2.1/src/glx/xdemos/glxgears.c
--- mesa-20.2.1-orig/src/glx/xdemos/glxgears.c	1969-12-31 18:00:00.000000000 -0600
+++ mesa-20.2.1/src/glx/xdemos/glxgears.c	2020-10-15 23:06:45.826695773 -0500
@@ -0,0 +1,809 @@
+/*
+ * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * This is a port of the infamous "gears" demo to straight GLX (i.e. no GLUT)
+ * Port by Brian Paul  23 March 2001
+ *
+ * See usage() below for command line options.
+ */
+
+
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <GL/glxext.h>
+
+#ifndef GLX_MESA_swap_control
+#define GLX_MESA_swap_control 1
+typedef int (*PFNGLXGETSWAPINTERVALMESAPROC)(void);
+#endif
+
+
+#define BENCHMARK
+
+#ifdef BENCHMARK
+
+/* XXX this probably isn't very portable */
+
+#include <sys/time.h>
+#include <unistd.h>
+
+/* return current time (in seconds) */
+static double
+current_time(void)
+{
+   struct timeval tv;
+#ifdef __VMS
+   (void) gettimeofday(&tv, NULL );
+#else
+   struct timezone tz;
+   (void) gettimeofday(&tv, &tz);
+#endif
+   return (double) tv.tv_sec + tv.tv_usec / 1000000.0;
+}
+
+#else /*BENCHMARK*/
+
+/* dummy */
+static double
+current_time(void)
+{
+   /* update this function for other platforms! */
+   static double t = 0.0;
+   static int warn = 1;
+   if (warn) {
+      fprintf(stderr, "Warning: current_time() not implemented!!\n");
+      warn = 0;
+   }
+   return t += 1.0;
+}
+
+#endif /*BENCHMARK*/
+
+
+
+#ifndef M_PI
+#define M_PI 3.14159265
+#endif
+
+
+/** Event handler results: */
+#define NOP 0
+#define EXIT 1
+#define DRAW 2
+
+static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
+static GLint gear1, gear2, gear3;
+static GLfloat angle = 0.0;
+
+static GLboolean fullscreen = GL_FALSE;	/* Create a single fullscreen window */
+static GLboolean stereo = GL_FALSE;	/* Enable stereo.  */
+static GLint samples = 0;               /* Choose visual with at least N samples. */
+static GLboolean animate = GL_TRUE;	/* Animation */
+static GLfloat eyesep = 5.0;		/* Eye separation. */
+static GLfloat fix_point = 40.0;	/* Fixation point distance.  */
+static GLfloat left, right, asp;	/* Stereo frustum params.  */
+
+
+/*
+ *
+ *  Draw a gear wheel.  You'll probably want to call this function when
+ *  building a display list since we do a lot of trig here.
+ * 
+ *  Input:  inner_radius - radius of hole at center
+ *          outer_radius - radius at center of teeth
+ *          width - width of gear
+ *          teeth - number of teeth
+ *          tooth_depth - depth of tooth
+ */
+static void
+gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
+     GLint teeth, GLfloat tooth_depth)
+{
+   GLint i;
+   GLfloat r0, r1, r2;
+   GLfloat angle, da;
+   GLfloat u, v, len;
+
+   r0 = inner_radius;
+   r1 = outer_radius - tooth_depth / 2.0;
+   r2 = outer_radius + tooth_depth / 2.0;
+
+   da = 2.0 * M_PI / teeth / 4.0;
+
+   glShadeModel(GL_FLAT);
+
+   glNormal3f(0.0, 0.0, 1.0);
+
+   /* draw front face */
+   glBegin(GL_QUAD_STRIP);
+   for (i = 0; i <= teeth; i++) {
+      angle = i * 2.0 * M_PI / teeth;
+      glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
+      glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
+      if (i < teeth) {
+	 glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
+	 glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
+		    width * 0.5);
+      }
+   }
+   glEnd();
+
+   /* draw front sides of teeth */
+   glBegin(GL_QUADS);
+   da = 2.0 * M_PI / teeth / 4.0;
+   for (i = 0; i < teeth; i++) {
+      angle = i * 2.0 * M_PI / teeth;
+
+      glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
+      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
+      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
+		 width * 0.5);
+      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
+		 width * 0.5);
+   }
+   glEnd();
+
+   glNormal3f(0.0, 0.0, -1.0);
+
+   /* draw back face */
+   glBegin(GL_QUAD_STRIP);
+   for (i = 0; i <= teeth; i++) {
+      angle = i * 2.0 * M_PI / teeth;
+      glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
+      glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
+      if (i < teeth) {
+	 glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
+		    -width * 0.5);
+	 glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
+      }
+   }
+   glEnd();
+
+   /* draw back sides of teeth */
+   glBegin(GL_QUADS);
+   da = 2.0 * M_PI / teeth / 4.0;
+   for (i = 0; i < teeth; i++) {
+      angle = i * 2.0 * M_PI / teeth;
+
+      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
+		 -width * 0.5);
+      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
+		 -width * 0.5);
+      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
+      glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
+   }
+   glEnd();
+
+   /* draw outward faces of teeth */
+   glBegin(GL_QUAD_STRIP);
+   for (i = 0; i < teeth; i++) {
+      angle = i * 2.0 * M_PI / teeth;
+
+      glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5);
+      glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5);
+      u = r2 * cos(angle + da) - r1 * cos(angle);
+      v = r2 * sin(angle + da) - r1 * sin(angle);
+      len = sqrt(u * u + v * v);
+      u /= len;
+      v /= len;
+      glNormal3f(v, -u, 0.0);
+      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5);
+      glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5);
+      glNormal3f(cos(angle), sin(angle), 0.0);
+      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
+		 width * 0.5);
+      glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da),
+		 -width * 0.5);
+      u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da);
+      v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da);
+      glNormal3f(v, -u, 0.0);
+      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
+		 width * 0.5);
+      glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da),
+		 -width * 0.5);
+      glNormal3f(cos(angle), sin(angle), 0.0);
+   }
+
+   glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5);
+   glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5);
+
+   glEnd();
+
+   glShadeModel(GL_SMOOTH);
+
+   /* draw inside radius cylinder */
+   glBegin(GL_QUAD_STRIP);
+   for (i = 0; i <= teeth; i++) {
+      angle = i * 2.0 * M_PI / teeth;
+      glNormal3f(-cos(angle), -sin(angle), 0.0);
+      glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5);
+      glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5);
+   }
+   glEnd();
+}
+
+
+static void
+draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glPushMatrix();
+   glRotatef(view_rotx, 1.0, 0.0, 0.0);
+   glRotatef(view_roty, 0.0, 1.0, 0.0);
+   glRotatef(view_rotz, 0.0, 0.0, 1.0);
+
+   glPushMatrix();
+   glTranslatef(-3.0, -2.0, 0.0);
+   glRotatef(angle, 0.0, 0.0, 1.0);
+   glCallList(gear1);
+   glPopMatrix();
+
+   glPushMatrix();
+   glTranslatef(3.1, -2.0, 0.0);
+   glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0);
+   glCallList(gear2);
+   glPopMatrix();
+
+   glPushMatrix();
+   glTranslatef(-3.1, 4.2, 0.0);
+   glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0);
+   glCallList(gear3);
+   glPopMatrix();
+
+   glPopMatrix();
+}
+
+
+static void
+draw_gears(void)
+{
+   if (stereo) {
+      /* First left eye.  */
+      glDrawBuffer(GL_BACK_LEFT);
+
+      glMatrixMode(GL_PROJECTION);
+      glLoadIdentity();
+      glFrustum(left, right, -asp, asp, 5.0, 60.0);
+
+      glMatrixMode(GL_MODELVIEW);
+
+      glPushMatrix();
+      glTranslated(+0.5 * eyesep, 0.0, 0.0);
+      draw();
+      glPopMatrix();
+
+      /* Then right eye.  */
+      glDrawBuffer(GL_BACK_RIGHT);
+
+      glMatrixMode(GL_PROJECTION);
+      glLoadIdentity();
+      glFrustum(-right, -left, -asp, asp, 5.0, 60.0);
+
+      glMatrixMode(GL_MODELVIEW);
+
+      glPushMatrix();
+      glTranslated(-0.5 * eyesep, 0.0, 0.0);
+      draw();
+      glPopMatrix();
+   }
+   else {
+      draw();
+   }
+}
+
+
+/** Draw single frame, do SwapBuffers, compute FPS */
+static void
+draw_frame(Display *dpy, Window win)
+{
+   static int frames = 0;
+   static double tRot0 = -1.0, tRate0 = -1.0;
+   double dt, t = current_time();
+
+   if (tRot0 < 0.0)
+      tRot0 = t;
+   dt = t - tRot0;
+   tRot0 = t;
+
+   if (animate) {
+      /* advance rotation for next frame */
+      angle += 70.0 * dt;  /* 70 degrees per second */
+      if (angle > 3600.0)
+         angle -= 3600.0;
+   }
+
+   draw_gears();
+   glXSwapBuffers(dpy, win);
+
+   frames++;
+   
+   if (tRate0 < 0.0)
+      tRate0 = t;
+   if (t - tRate0 >= 5.0) {
+      GLfloat seconds = t - tRate0;
+      GLfloat fps = frames / seconds;
+      printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds,
+             fps);
+      fflush(stdout);
+      tRate0 = t;
+      frames = 0;
+   }
+}
+
+
+/* new window size or exposure */
+static void
+reshape(int width, int height)
+{
+   glViewport(0, 0, (GLint) width, (GLint) height);
+
+   if (stereo) {
+      GLfloat w;
+
+      asp = (GLfloat) height / (GLfloat) width;
+      w = fix_point * (1.0 / 5.0);
+
+      left = -5.0 * ((w - 0.5 * eyesep) / fix_point);
+      right = 5.0 * ((w + 0.5 * eyesep) / fix_point);
+   }
+   else {
+      GLfloat h = (GLfloat) height / (GLfloat) width;
+
+      glMatrixMode(GL_PROJECTION);
+      glLoadIdentity();
+      glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
+   }
+   
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0.0, 0.0, -40.0);
+}
+   
+
+
+static void
+init(void)
+{
+   static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 };
+   static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 };
+   static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 };
+   static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 };
+
+   glLightfv(GL_LIGHT0, GL_POSITION, pos);
+   glEnable(GL_CULL_FACE);
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+   glEnable(GL_DEPTH_TEST);
+
+   /* make the gears */
+   gear1 = glGenLists(1);
+   glNewList(gear1, GL_COMPILE);
+   glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
+   gear(1.0, 4.0, 1.0, 20, 0.7);
+   glEndList();
+
+   gear2 = glGenLists(1);
+   glNewList(gear2, GL_COMPILE);
+   glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green);
+   gear(0.5, 2.0, 2.0, 10, 0.7);
+   glEndList();
+
+   gear3 = glGenLists(1);
+   glNewList(gear3, GL_COMPILE);
+   glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue);
+   gear(1.3, 2.0, 0.5, 10, 0.7);
+   glEndList();
+
+   glEnable(GL_NORMALIZE);
+}
+
+
+/**
+ * Remove window border/decorations.
+ */
+static void
+no_border( Display *dpy, Window w)
+{
+   static const unsigned MWM_HINTS_DECORATIONS = (1 << 1);
+   static const int PROP_MOTIF_WM_HINTS_ELEMENTS = 5;
+
+   typedef struct
+   {
+      unsigned long       flags;
+      unsigned long       functions;
+      unsigned long       decorations;
+      long                inputMode;
+      unsigned long       status;
+   } PropMotifWmHints;
+
+   PropMotifWmHints motif_hints;
+   Atom prop, proptype;
+   unsigned long flags = 0;
+
+   /* setup the property */
+   motif_hints.flags = MWM_HINTS_DECORATIONS;
+   motif_hints.decorations = flags;
+
+   /* get the atom for the property */
+   prop = XInternAtom( dpy, "_MOTIF_WM_HINTS", True );
+   if (!prop) {
+      /* something went wrong! */
+      return;
+   }
+
+   /* not sure this is correct, seems to work, XA_WM_HINTS didn't work */
+   proptype = prop;
+
+   XChangeProperty( dpy, w,                         /* display, window */
+                    prop, proptype,                 /* property, type */
+                    32,                             /* format: 32-bit datums */
+                    PropModeReplace,                /* mode */
+                    (unsigned char *) &motif_hints, /* data */
+                    PROP_MOTIF_WM_HINTS_ELEMENTS    /* nelements */
+                  );
+}
+
+
+/*
+ * Create an RGB, double-buffered window.
+ * Return the window and context handles.
+ */
+static void
+make_window( Display *dpy, const char *name,
+             int x, int y, int width, int height,
+             Window *winRet, GLXContext *ctxRet, VisualID *visRet)
+{
+   int attribs[64];
+   int i = 0;
+
+   int scrnum;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+   Window win;
+   GLXContext ctx;
+   XVisualInfo *visinfo;
+
+   /* Singleton attributes. */
+   attribs[i++] = GLX_RGBA;
+   attribs[i++] = GLX_DOUBLEBUFFER;
+   if (stereo)
+      attribs[i++] = GLX_STEREO;
+
+   /* Key/value attributes. */
+   attribs[i++] = GLX_RED_SIZE;
+   attribs[i++] = 1;
+   attribs[i++] = GLX_GREEN_SIZE;
+   attribs[i++] = 1;
+   attribs[i++] = GLX_BLUE_SIZE;
+   attribs[i++] = 1;
+   attribs[i++] = GLX_DEPTH_SIZE;
+   attribs[i++] = 1;
+   if (samples > 0) {
+      attribs[i++] = GLX_SAMPLE_BUFFERS;
+      attribs[i++] = 1;
+      attribs[i++] = GLX_SAMPLES;
+      attribs[i++] = samples;
+   }
+
+   attribs[i++] = None;
+
+   scrnum = DefaultScreen( dpy );
+   root = RootWindow( dpy, scrnum );
+
+   visinfo = glXChooseVisual(dpy, scrnum, attribs);
+   if (!visinfo) {
+      printf("Error: couldn't get an RGB, Double-buffered");
+      if (stereo)
+         printf(", Stereo");
+      if (samples > 0)
+         printf(", Multisample");
+      printf(" visual\n");
+      exit(1);
+   }
+
+   /* window attributes */
+   attr.background_pixel = 0;
+   attr.border_pixel = 0;
+   attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
+   attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
+   /* XXX this is a bad way to get a borderless window! */
+   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+
+   win = XCreateWindow( dpy, root, x, y, width, height,
+		        0, visinfo->depth, InputOutput,
+		        visinfo->visual, mask, &attr );
+
+   if (fullscreen)
+      no_border(dpy, win);
+
+   /* set hints and properties */
+   {
+      XSizeHints sizehints;
+      sizehints.x = x;
+      sizehints.y = y;
+      sizehints.width  = width;
+      sizehints.height = height;
+      sizehints.flags = USSize | USPosition;
+      XSetNormalHints(dpy, win, &sizehints);
+      XSetStandardProperties(dpy, win, name, name,
+                              None, (char **)NULL, 0, &sizehints);
+   }
+
+   ctx = glXCreateContext( dpy, visinfo, NULL, True );
+   if (!ctx) {
+      printf("Error: glXCreateContext failed\n");
+      exit(1);
+   }
+
+   *winRet = win;
+   *ctxRet = ctx;
+   *visRet = visinfo->visualid;
+
+   XFree(visinfo);
+}
+
+
+/**
+ * Determine whether or not a GLX extension is supported.
+ */
+static int
+is_glx_extension_supported(Display *dpy, const char *query)
+{
+   const int scrnum = DefaultScreen(dpy);
+   const char *glx_extensions = NULL;
+   const size_t len = strlen(query);
+   const char *ptr;
+
+   if (glx_extensions == NULL) {
+      glx_extensions = glXQueryExtensionsString(dpy, scrnum);
+   }
+
+   ptr = strstr(glx_extensions, query);
+   return ((ptr != NULL) && ((ptr[len] == ' ') || (ptr[len] == '\0')));
+}
+
+
+/**
+ * Attempt to determine whether or not the display is synched to vblank.
+ */
+static void
+query_vsync(Display *dpy, GLXDrawable drawable)
+{
+   int interval = 0;
+
+#if defined(GLX_EXT_swap_control)
+   if (is_glx_extension_supported(dpy, "GLX_EXT_swap_control")) {
+       unsigned int tmp = -1;
+       glXQueryDrawable(dpy, drawable, GLX_SWAP_INTERVAL_EXT, &tmp);
+       interval = tmp;
+   } else
+#endif
+   if (is_glx_extension_supported(dpy, "GLX_MESA_swap_control")) {
+      PFNGLXGETSWAPINTERVALMESAPROC pglXGetSwapIntervalMESA =
+          (PFNGLXGETSWAPINTERVALMESAPROC)
+          glXGetProcAddressARB((const GLubyte *) "glXGetSwapIntervalMESA");
+
+      interval = (*pglXGetSwapIntervalMESA)();
+   } else if (is_glx_extension_supported(dpy, "GLX_SGI_swap_control")) {
+      /* The default swap interval with this extension is 1.  Assume that it
+       * is set to the default.
+       *
+       * Many Mesa-based drivers default to 0, but all of these drivers also
+       * export GLX_MESA_swap_control.  In that case, this branch will never
+       * be taken, and the correct result should be reported.
+       */
+      interval = 1;
+   }
+
+
+   if (interval > 0) {
+      printf("Running synchronized to the vertical refresh.  The framerate should be\n");
+      if (interval == 1) {
+         printf("approximately the same as the monitor refresh rate.\n");
+      } else if (interval > 1) {
+         printf("approximately 1/%d the monitor refresh rate.\n",
+                interval);
+      }
+   }
+}
+
+/**
+ * Handle one X event.
+ * \return NOP, EXIT or DRAW
+ */
+static int
+handle_event(Display *dpy, Window win, XEvent *event)
+{
+   (void) dpy;
+   (void) win;
+
+   switch (event->type) {
+   case Expose:
+      return DRAW;
+   case ConfigureNotify:
+      reshape(event->xconfigure.width, event->xconfigure.height);
+      break;
+   case KeyPress:
+      {
+         char buffer[10];
+         int code;
+         code = XLookupKeysym(&event->xkey, 0);
+         if (code == XK_Left) {
+            view_roty += 5.0;
+         }
+         else if (code == XK_Right) {
+            view_roty -= 5.0;
+         }
+         else if (code == XK_Up) {
+            view_rotx += 5.0;
+         }
+         else if (code == XK_Down) {
+            view_rotx -= 5.0;
+         }
+         else {
+            XLookupString(&event->xkey, buffer, sizeof(buffer),
+                          NULL, NULL);
+            if (buffer[0] == 27) {
+               /* escape */
+               return EXIT;
+            }
+            else if (buffer[0] == 'a' || buffer[0] == 'A') {
+               animate = !animate;
+            }
+         }
+         return DRAW;
+      }
+   }
+   return NOP;
+}
+
+
+static void
+event_loop(Display *dpy, Window win)
+{
+   while (1) {
+      int op;
+      while (!animate || XPending(dpy) > 0) {
+         XEvent event;
+         XNextEvent(dpy, &event);
+         op = handle_event(dpy, win, &event);
+         if (op == EXIT)
+            return;
+         else if (op == DRAW)
+            break;
+      }
+
+      draw_frame(dpy, win);
+   }
+}
+
+
+static void
+usage(void)
+{
+   printf("Usage:\n");
+   printf("  -display <displayname>  set the display to run on\n");
+   printf("  -stereo                 run in stereo mode\n");
+   printf("  -samples N              run in multisample mode with at least N samples\n");
+   printf("  -fullscreen             run in fullscreen mode\n");
+   printf("  -info                   display OpenGL renderer info\n");
+   printf("  -geometry WxH+X+Y       window geometry\n");
+}
+ 
+
+int
+main(int argc, char *argv[])
+{
+   unsigned int winWidth = 300, winHeight = 300;
+   int x = 0, y = 0;
+   Display *dpy;
+   Window win;
+   GLXContext ctx;
+   char *dpyName = NULL;
+   GLboolean printInfo = GL_FALSE;
+   VisualID visId;
+   int i;
+
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-display") == 0) {
+         dpyName = argv[i+1];
+         i++;
+      }
+      else if (strcmp(argv[i], "-info") == 0) {
+         printInfo = GL_TRUE;
+      }
+      else if (strcmp(argv[i], "-stereo") == 0) {
+         stereo = GL_TRUE;
+      }
+      else if (i < argc-1 && strcmp(argv[i], "-samples") == 0) {
+         samples = strtod(argv[i+1], NULL );
+         ++i;
+      }
+      else if (strcmp(argv[i], "-fullscreen") == 0) {
+         fullscreen = GL_TRUE;
+      }
+      else if (i < argc-1 && strcmp(argv[i], "-geometry") == 0) {
+         XParseGeometry(argv[i+1], &x, &y, &winWidth, &winHeight);
+         i++;
+      }
+      else {
+         usage();
+         return -1;
+      }
+   }
+
+   dpy = XOpenDisplay(dpyName);
+   if (!dpy) {
+      printf("Error: couldn't open display %s\n",
+	     dpyName ? dpyName : getenv("DISPLAY"));
+      return -1;
+   }
+
+   if (fullscreen) {
+      int scrnum = DefaultScreen(dpy);
+
+      x = 0; y = 0;
+      winWidth = DisplayWidth(dpy, scrnum);
+      winHeight = DisplayHeight(dpy, scrnum);
+   }
+
+   make_window(dpy, "glxgears", x, y, winWidth, winHeight, &win, &ctx, &visId);
+   XMapWindow(dpy, win);
+   glXMakeCurrent(dpy, win, ctx);
+   query_vsync(dpy, win);
+
+   if (printInfo) {
+      printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+      printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+      printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+      printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
+      printf("VisualID %d, 0x%x\n", (int) visId, (int) visId);
+   }
+
+   init();
+
+   /* Set initial projection/viewing transformation.
+    * We can't be sure we'll get a ConfigureNotify event when the window
+    * first appears.
+    */
+   reshape(winWidth, winHeight);
+
+   event_loop(dpy, win);
+
+   glDeleteLists(gear1, 1);
+   glDeleteLists(gear2, 1);
+   glDeleteLists(gear3, 1);
+   glXMakeCurrent(dpy, None, NULL);
+   glXDestroyContext(dpy, ctx);
+   XDestroyWindow(dpy, win);
+   XCloseDisplay(dpy);
+
+   return 0;
+}
diff -Naurp mesa-20.2.1-orig/src/glx/xdemos/glxinfo.1 mesa-20.2.1/src/glx/xdemos/glxinfo.1
--- mesa-20.2.1-orig/src/glx/xdemos/glxinfo.1	1969-12-31 18:00:00.000000000 -0600
+++ mesa-20.2.1/src/glx/xdemos/glxinfo.1	2020-10-15 23:06:45.826695773 -0500
@@ -0,0 +1,46 @@
+.TH glxinfo 1 "2006-11-29"
+.SH NAME
+glxinfo \- show information about the GLX implementation
+.SH SYNOPSIS
+.B glxinfo
+.RI [ options ]
+.SH DESCRIPTION
+The \fIglxinfo\fP program shows information about the OpenGL and GLX
+implementations running on a given X display.
+.PP
+The information includes details about the server- and client-side GLX
+implementation, the OpenGL and GLU implementations as well as a list
+of available GLX visuals.
+.SH OPTIONS
+.TP 8
+.B \-v
+Print visuals info in verbose form.
+.TP 8
+.B \-t
+Print verbose table.
+.TP 8
+.B \-display \fIdisplay\fP
+Specify the X display to interrogate.
+.TP 8
+.B \-h
+Print usage information.
+.TP 8
+.B \-i
+Force an indirect rendering context.
+.TP 8
+.B \-b
+Find the "best" visual and print its number.
+.TP 8
+.B \-l
+Print interesting OpenGL limits.
+.TP 8
+.B \-s
+Print a single extension per line.
+.SH AUTHOR
+glxinfo was written by Brian Paul <brian.paul@tungstengraphics.com>.
+.PP
+This manual page was written by Thierry Reding <thierry@gilfi.de>, for the
+Debian project and updated by Fernando de Oliveira <famobr at yahoo dot
+com dot br>, for the Linux From Scratch (LFS) project (but may be used by
+others).
+
diff -Naurp mesa-20.2.1-orig/src/glx/xdemos/glxinfo.c mesa-20.2.1/src/glx/xdemos/glxinfo.c
--- mesa-20.2.1-orig/src/glx/xdemos/glxinfo.c	1969-12-31 18:00:00.000000000 -0600
+++ mesa-20.2.1/src/glx/xdemos/glxinfo.c	2020-10-15 23:06:45.826695773 -0500
@@ -0,0 +1,1281 @@
+/*
+ * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * This program is a work-alike of the IRIX glxinfo program.
+ * Command line options:
+ *  -t                     print wide table
+ *  -v                     print verbose information
+ *  -display DisplayName   specify the X display to interogate
+ *  -B                     brief, print only the basics
+ *  -b                     only print ID of "best" visual on screen 0
+ *  -i                     use indirect rendering connection only
+ *  -l                     print interesting OpenGL limits (added 5 Sep 2002)
+ *
+ * Brian Paul  26 January 2000
+ */
+
+#define GLX_GLXEXT_PROTOTYPES
+#define GL_GLEXT_PROTOTYPES
+
+#include <assert.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "glinfo_common.h"
+
+
+#ifndef GLX_NONE_EXT
+#define GLX_NONE_EXT  0x8000
+#endif
+
+#ifndef GLX_TRANSPARENT_RGB
+#define GLX_TRANSPARENT_RGB 0x8008
+#endif
+
+#ifndef GLX_RGBA_BIT
+#define GLX_RGBA_BIT			0x00000001
+#endif
+
+#ifndef GLX_COLOR_INDEX_BIT
+#define GLX_COLOR_INDEX_BIT		0x00000002
+#endif
+
+
+struct visual_attribs
+{
+   /* X visual attribs */
+   int id;		/* May be visual ID or FBConfig ID */
+   int vis_id;		/* Visual ID.  Only set for FBConfigs */
+   int klass;
+   int depth;
+   int redMask, greenMask, blueMask;
+   int colormapSize;
+   int bitsPerRGB;
+
+   /* GL visual attribs */
+   int supportsGL;
+   int drawableType;
+   int transparentType;
+   int transparentRedValue;
+   int transparentGreenValue;
+   int transparentBlueValue;
+   int transparentAlphaValue;
+   int transparentIndexValue;
+   int bufferSize;
+   int level;
+   int render_type;
+   int doubleBuffer;
+   int stereo;
+   int auxBuffers;
+   int redSize, greenSize, blueSize, alphaSize;
+   int depthSize;
+   int stencilSize;
+   int accumRedSize, accumGreenSize, accumBlueSize, accumAlphaSize;
+   int numSamples, numMultisample;
+   int visualCaveat;
+   int floatComponents;
+   int packedfloatComponents;
+   int srgb;
+};
+
+   
+/**
+ * Version of the context that was created
+ *
+ * 20, 21, 30, 31, 32, etc.
+ */
+static int version;
+
+/**
+ * GL Error checking/warning.
+ */
+static void
+CheckError(int line)
+{
+   int n;
+   n = glGetError();
+   if (n)
+      printf("Warning: GL error 0x%x at line %d\n", n, line);
+}
+
+
+static void
+print_display_info(Display *dpy)
+{
+   printf("name of display: %s\n", DisplayString(dpy));
+}
+
+
+/**
+ * Choose a simple FB Config.
+ */
+static GLXFBConfig *
+choose_fb_config(Display *dpy, int scrnum)
+{
+   int fbAttribSingle[] = {
+      GLX_RENDER_TYPE,   GLX_RGBA_BIT,
+      GLX_RED_SIZE,      1,
+      GLX_GREEN_SIZE,    1,
+      GLX_BLUE_SIZE,     1,
+      GLX_DOUBLEBUFFER,  False,
+      None };
+   int fbAttribDouble[] = {
+      GLX_RENDER_TYPE,   GLX_RGBA_BIT,
+      GLX_RED_SIZE,      1,
+      GLX_GREEN_SIZE,    1,
+      GLX_BLUE_SIZE,     1,
+      GLX_DOUBLEBUFFER,  True,
+      None };
+   GLXFBConfig *configs;
+   int nConfigs;
+
+   configs = glXChooseFBConfig(dpy, scrnum, fbAttribSingle, &nConfigs);
+   if (!configs)
+      configs = glXChooseFBConfig(dpy, scrnum, fbAttribDouble, &nConfigs);
+
+   return configs;
+}
+
+
+static Bool CreateContextErrorFlag;
+
+static int
+create_context_error_handler(Display *dpy, XErrorEvent *error)
+{
+   (void) dpy;
+   (void) error->error_code;
+   CreateContextErrorFlag = True;
+   return 0;
+}
+
+
+/**
+ * Try to create a GLX context of the given version with flags/options.
+ * Note: A version number is required in order to get a core profile
+ * (at least w/ NVIDIA).
+ */
+static GLXContext
+create_context_flags(Display *dpy, GLXFBConfig fbconfig, int major, int minor,
+                     int contextFlags, int profileMask, Bool direct)
+{
+#ifdef GLX_ARB_create_context
+   static PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB_func = 0;
+   static Bool firstCall = True;
+   int (*old_handler)(Display *, XErrorEvent *);
+   GLXContext context;
+   int attribs[20];
+   int n = 0;
+
+   if (firstCall) {
+      /* See if we have GLX_ARB_create_context_profile and get pointer to
+       * glXCreateContextAttribsARB() function.
+       */
+      const char *glxExt = glXQueryExtensionsString(dpy, 0);
+      if (extension_supported("GLX_ARB_create_context_profile", glxExt)) {
+         glXCreateContextAttribsARB_func = (PFNGLXCREATECONTEXTATTRIBSARBPROC)
+            glXGetProcAddress((const GLubyte *) "glXCreateContextAttribsARB");
+      }
+      firstCall = False;
+   }
+
+   if (!glXCreateContextAttribsARB_func)
+      return 0;
+
+   /* setup attribute array */
+   if (major) {
+      attribs[n++] = GLX_CONTEXT_MAJOR_VERSION_ARB;
+      attribs[n++] = major;
+      attribs[n++] = GLX_CONTEXT_MINOR_VERSION_ARB;
+      attribs[n++] = minor;
+   }
+   if (contextFlags) {
+      attribs[n++] = GLX_CONTEXT_FLAGS_ARB;
+      attribs[n++] = contextFlags;
+   }
+#ifdef GLX_ARB_create_context_profile
+   if (profileMask) {
+      attribs[n++] = GLX_CONTEXT_PROFILE_MASK_ARB;
+      attribs[n++] = profileMask;
+   }
+#endif
+   attribs[n++] = 0;
+
+   /* install X error handler */
+   old_handler = XSetErrorHandler(create_context_error_handler);
+   CreateContextErrorFlag = False;
+
+   /* try creating context */
+   context = glXCreateContextAttribsARB_func(dpy,
+                                             fbconfig,
+                                             0, /* share_context */
+                                             direct,
+                                             attribs);
+
+   /* restore error handler */
+   XSetErrorHandler(old_handler);
+
+   if (CreateContextErrorFlag)
+      context = 0;
+
+   if (context && direct) {
+      if (!glXIsDirect(dpy, context)) {
+         glXDestroyContext(dpy, context);
+         return 0;
+      }
+   }
+
+   return context;
+#else
+   return 0;
+#endif
+}
+
+
+/**
+ * Try to create a GLX context of the newest version.
+ */
+static GLXContext
+create_context_with_config(Display *dpy, GLXFBConfig config,
+                           Bool coreProfile, Bool es2Profile, Bool direct)
+{
+   GLXContext ctx = 0;
+
+   if (coreProfile) {
+      /* Try to create a core profile, starting with the newest version of
+       * GL that we're aware of.  If we don't specify the version
+       */
+      int i;
+      for (i = 0; gl_versions[i].major > 0; i++) {
+          /* don't bother below GL 3.0 */
+          if (gl_versions[i].major == 3 &&
+              gl_versions[i].minor == 0)
+             return 0;
+         ctx = create_context_flags(dpy, config,
+                                    gl_versions[i].major,
+                                    gl_versions[i].minor,
+                                    0x0,
+                                    GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
+                                    direct);
+         if (ctx)
+            return ctx;
+      }
+      /* couldn't get core profile context */
+      return 0;
+   }
+
+   if (es2Profile) {
+#ifdef GLX_CONTEXT_ES2_PROFILE_BIT_EXT
+      if (extension_supported("GLX_EXT_create_context_es2_profile",
+                              glXQueryExtensionsString(dpy, 0))) {
+         ctx = create_context_flags(dpy, config, 2, 0, 0x0,
+                                    GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
+                                    direct);
+         return ctx;
+      }
+#endif
+      return 0;
+   }
+
+   /* GLX should return a context of the latest GL version that supports
+    * the full profile.
+    */
+   ctx = glXCreateNewContext(dpy, config, GLX_RGBA_TYPE, NULL, direct);
+
+   /* make sure the context is direct, if direct was requested */
+   if (ctx && direct) {
+      if (!glXIsDirect(dpy, ctx)) {
+         glXDestroyContext(dpy, ctx);
+         return 0;
+      }
+   }
+
+   return ctx;
+}
+
+
+static XVisualInfo *
+choose_xvisinfo(Display *dpy, int scrnum)
+{
+   int attribSingle[] = {
+      GLX_RGBA,
+      GLX_RED_SIZE, 1,
+      GLX_GREEN_SIZE, 1,
+      GLX_BLUE_SIZE, 1,
+      None };
+   int attribDouble[] = {
+      GLX_RGBA,
+      GLX_RED_SIZE, 1,
+      GLX_GREEN_SIZE, 1,
+      GLX_BLUE_SIZE, 1,
+      GLX_DOUBLEBUFFER,
+      None };
+   XVisualInfo *visinfo;
+
+   visinfo = glXChooseVisual(dpy, scrnum, attribSingle);
+   if (!visinfo)
+      visinfo = glXChooseVisual(dpy, scrnum, attribDouble);
+
+   return visinfo;
+}
+
+
+static void
+query_renderer(void)
+{
+#ifdef GLX_MESA_query_renderer
+    PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC queryInteger;
+    PFNGLXQUERYCURRENTRENDERERSTRINGMESAPROC queryString;
+    unsigned int v[3];
+
+    queryInteger = (PFNGLXQUERYCURRENTRENDERERINTEGERMESAPROC)
+	glXGetProcAddressARB((const GLubyte *)
+			     "glXQueryCurrentRendererIntegerMESA");
+    queryString = (PFNGLXQUERYCURRENTRENDERERSTRINGMESAPROC)
+	glXGetProcAddressARB((const GLubyte *)
+			     "glXQueryCurrentRendererStringMESA");
+
+    printf("Extended renderer info (GLX_MESA_query_renderer):\n");
+    queryInteger(GLX_RENDERER_VENDOR_ID_MESA, v);
+    printf("    Vendor: %s (0x%x)\n",
+	   queryString(GLX_RENDERER_VENDOR_ID_MESA), *v);
+    queryInteger(GLX_RENDERER_DEVICE_ID_MESA, v);
+    printf("    Device: %s (0x%x)\n",
+	   queryString(GLX_RENDERER_DEVICE_ID_MESA), *v);
+    queryInteger(GLX_RENDERER_VERSION_MESA, v);
+    printf("    Version: %d.%d.%d\n", v[0], v[1], v[2]);
+    queryInteger(GLX_RENDERER_ACCELERATED_MESA, v);
+    printf("    Accelerated: %s\n", *v ? "yes" : "no");
+    queryInteger(GLX_RENDERER_VIDEO_MEMORY_MESA, v);
+    printf("    Video memory: %dMB\n", *v);
+    queryInteger(GLX_RENDERER_UNIFIED_MEMORY_ARCHITECTURE_MESA, v);
+    printf("    Unified memory: %s\n", *v ? "yes" : "no");
+    queryInteger(GLX_RENDERER_PREFERRED_PROFILE_MESA, v);
+    printf("    Preferred profile: %s (0x%x)\n",
+	   *v == GLX_CONTEXT_CORE_PROFILE_BIT_ARB ? "core" :
+	   *v == GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB ? "compat" :
+	   "unknown", *v);
+    queryInteger(GLX_RENDERER_OPENGL_CORE_PROFILE_VERSION_MESA, v);
+    printf("    Max core profile version: %d.%d\n", v[0], v[1]);
+    queryInteger(GLX_RENDERER_OPENGL_COMPATIBILITY_PROFILE_VERSION_MESA, v);
+    printf("    Max compat profile version: %d.%d\n", v[0], v[1]);
+    queryInteger(GLX_RENDERER_OPENGL_ES_PROFILE_VERSION_MESA, v);
+    printf("    Max GLES1 profile version: %d.%d\n", v[0], v[1]);
+    queryInteger(GLX_RENDERER_OPENGL_ES2_PROFILE_VERSION_MESA, v);
+    printf("    Max GLES[23] profile version: %d.%d\n", v[0], v[1]);
+#endif
+}
+
+
+static Bool
+print_screen_info(Display *dpy, int scrnum,
+                  const struct options *opts,
+                  Bool coreProfile, Bool es2Profile, Bool limits,
+                  Bool coreWorked)
+{
+   Window win;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+   GLXContext ctx = NULL;
+   XVisualInfo *visinfo;
+   int width = 100, height = 100;
+   GLXFBConfig *fbconfigs;
+   const char *oglstring = coreProfile ? "OpenGL core profile" :
+                           es2Profile ? "OpenGL ES profile" : "OpenGL";
+
+   root = RootWindow(dpy, scrnum);
+
+   /*
+    * Choose FBConfig or XVisualInfo and create a context.
+    */
+   fbconfigs = choose_fb_config(dpy, scrnum);
+   if (fbconfigs) {
+      ctx = create_context_with_config(dpy, fbconfigs[0],
+                                       coreProfile, es2Profile,
+                                       opts->allowDirect);
+      if (!ctx && opts->allowDirect && !coreProfile) {
+         /* try indirect */
+         ctx = create_context_with_config(dpy, fbconfigs[0],
+                                          coreProfile, es2Profile, False);
+      }
+
+      visinfo = glXGetVisualFromFBConfig(dpy, fbconfigs[0]);
+      XFree(fbconfigs);
+   }
+   else if (!coreProfile && !es2Profile) {
+      visinfo = choose_xvisinfo(dpy, scrnum);
+      if (visinfo)
+	 ctx = glXCreateContext(dpy, visinfo, NULL, opts->allowDirect);
+   } else
+      visinfo = NULL;
+
+   if (!visinfo && !coreProfile && !es2Profile) {
+      fprintf(stderr, "Error: couldn't find RGB GLX visual or fbconfig\n");
+      return False;
+   }
+
+   if (!ctx) {
+      if (!coreProfile && !es2Profile)
+	 fprintf(stderr, "Error: glXCreateContext failed\n");
+      XFree(visinfo);
+      return False;
+   }
+
+   /*
+    * Create a window so that we can just bind the context.
+    */
+   attr.background_pixel = 0;
+   attr.border_pixel = 0;
+   attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
+   attr.event_mask = StructureNotifyMask | ExposureMask;
+   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+   win = XCreateWindow(dpy, root, 0, 0, width, height,
+		       0, visinfo->depth, InputOutput,
+		       visinfo->visual, mask, &attr);
+
+   if (glXMakeCurrent(dpy, win, ctx)) {
+      const char *serverVendor = glXQueryServerString(dpy, scrnum, GLX_VENDOR);
+      const char *serverVersion = glXQueryServerString(dpy, scrnum, GLX_VERSION);
+      const char *serverExtensions = glXQueryServerString(dpy, scrnum, GLX_EXTENSIONS);
+      const char *clientVendor = glXGetClientString(dpy, GLX_VENDOR);
+      const char *clientVersion = glXGetClientString(dpy, GLX_VERSION);
+      const char *clientExtensions = glXGetClientString(dpy, GLX_EXTENSIONS);
+      const char *glxExtensions = glXQueryExtensionsString(dpy, scrnum);
+      const char *glVendor = (const char *) glGetString(GL_VENDOR);
+      const char *glRenderer = (const char *) glGetString(GL_RENDERER);
+      const char *glVersion = (const char *) glGetString(GL_VERSION);
+      char *glExtensions = NULL;
+      int glxVersionMajor = 0;
+      int glxVersionMinor = 0;
+      char *displayName = NULL;
+      char *colon = NULL, *period = NULL;
+      struct ext_functions extfuncs;
+
+      CheckError(__LINE__);
+
+      /* Get some ext functions */
+      extfuncs.GetProgramivARB = (GETPROGRAMIVARBPROC)
+         glXGetProcAddressARB((GLubyte *) "glGetProgramivARB");
+      extfuncs.GetStringi = (GETSTRINGIPROC)
+         glXGetProcAddressARB((GLubyte *) "glGetStringi");
+      extfuncs.GetConvolutionParameteriv = (GETCONVOLUTIONPARAMETERIVPROC)
+         glXGetProcAddressARB((GLubyte *) "glGetConvolutionParameteriv");
+
+      if (!glXQueryVersion(dpy, & glxVersionMajor, & glxVersionMinor)) {
+         fprintf(stderr, "Error: glXQueryVersion failed\n");
+         exit(1);
+      }
+
+      /* Get list of GL extensions */
+      if (coreProfile && extfuncs.GetStringi)
+         glExtensions = build_core_profile_extension_list(&extfuncs);
+      if (!glExtensions) {
+         coreProfile = False;
+         glExtensions = (char *) glGetString(GL_EXTENSIONS);
+      }
+
+      CheckError(__LINE__);
+
+      if (!coreWorked) {
+         /* Strip the screen number from the display name, if present. */
+         if (!(displayName = (char *) malloc(strlen(DisplayString(dpy)) + 1))) {
+            fprintf(stderr, "Error: malloc() failed\n");
+            exit(1);
+         }
+         strcpy(displayName, DisplayString(dpy));
+         colon = strrchr(displayName, ':');
+         if (colon) {
+            period = strchr(colon, '.');
+            if (period)
+               *period = '\0';
+         }
+
+         printf("display: %s  screen: %d\n", displayName, scrnum);
+         free(displayName);
+         printf("direct rendering: ");
+         if (glXIsDirect(dpy, ctx)) {
+            printf("Yes\n");
+         }
+         else {
+            if (!opts->allowDirect) {
+               printf("No (-i specified)\n");
+            }
+            else if (getenv("LIBGL_ALWAYS_INDIRECT")) {
+               printf("No (LIBGL_ALWAYS_INDIRECT set)\n");
+            }
+            else {
+               printf("No (If you want to find out why, try setting "
+                      "LIBGL_DEBUG=verbose)\n");
+            }
+         }
+         if (opts->mode != Brief) {
+            printf("server glx vendor string: %s\n", serverVendor);
+            printf("server glx version string: %s\n", serverVersion);
+            printf("server glx extensions:\n");
+            print_extension_list(serverExtensions, opts->singleLine);
+            printf("client glx vendor string: %s\n", clientVendor);
+            printf("client glx version string: %s\n", clientVersion);
+            printf("client glx extensions:\n");
+            print_extension_list(clientExtensions, opts->singleLine);
+            printf("GLX version: %u.%u\n", glxVersionMajor, glxVersionMinor);
+            printf("GLX extensions:\n");
+            print_extension_list(glxExtensions, opts->singleLine);
+         }
+         if (strstr(glxExtensions, "GLX_MESA_query_renderer"))
+	    query_renderer();
+         printf("OpenGL vendor string: %s\n", glVendor);
+         printf("OpenGL renderer string: %s\n", glRenderer);
+      } else
+         printf("\n");
+
+      printf("%s version string: %s\n", oglstring, glVersion);
+
+      version = (glVersion[0] - '0') * 10 + (glVersion[2] - '0');
+
+      CheckError(__LINE__);
+
+#ifdef GL_VERSION_2_0
+      if (version >= 20) {
+         char *v = (char *) glGetString(GL_SHADING_LANGUAGE_VERSION);
+         printf("%s shading language version string: %s\n", oglstring, v);
+      }
+#endif
+      CheckError(__LINE__);
+#ifdef GL_VERSION_3_0
+      if (version >= 30 && !es2Profile) {
+         GLint flags;
+         glGetIntegerv(GL_CONTEXT_FLAGS, &flags);
+         printf("%s context flags: %s\n", oglstring, context_flags_string(flags));
+      }
+#endif
+      CheckError(__LINE__);
+#ifdef GL_VERSION_3_2
+      if (version >= 32 && !es2Profile) {
+         GLint mask;
+         glGetIntegerv(GL_CONTEXT_PROFILE_MASK, &mask);
+         printf("%s profile mask: %s\n", oglstring, profile_mask_string(mask));
+      }
+#endif
+
+      CheckError(__LINE__);
+
+      if (opts->mode != Brief) {
+         printf("%s extensions:\n", oglstring);
+         print_extension_list(glExtensions, opts->singleLine);
+      }
+
+      if (limits) {
+         print_limits(glExtensions, oglstring, version, &extfuncs);
+      }
+
+      if (coreProfile)
+         free(glExtensions);
+   }
+   else {
+      fprintf(stderr, "Error: glXMakeCurrent failed\n");
+   }
+
+   glXDestroyContext(dpy, ctx);
+   XFree(visinfo);
+   XDestroyWindow(dpy, win);
+   XSync(dpy, 1);
+   return True;
+}
+
+
+static const char *
+visual_class_name(int cls)
+{
+   switch (cls) {
+      case StaticColor:
+         return "StaticColor";
+      case PseudoColor:
+         return "PseudoColor";
+      case StaticGray:
+         return "StaticGray";
+      case GrayScale:
+         return "GrayScale";
+      case TrueColor:
+         return "TrueColor";
+      case DirectColor:
+         return "DirectColor";
+      default:
+         return "";
+   }
+}
+
+static const char *
+visual_drawable_type(int type)
+{
+   const static struct bit_info bits[] = {
+      { GLX_WINDOW_BIT, "window" },
+      { GLX_PIXMAP_BIT, "pixmap" },
+      { GLX_PBUFFER_BIT, "pbuffer" }
+   };
+
+   return bitmask_to_string(bits, ELEMENTS(bits), type);
+}
+
+static const char *
+visual_class_abbrev(int cls)
+{
+   switch (cls) {
+      case StaticColor:
+         return "sc";
+      case PseudoColor:
+         return "pc";
+      case StaticGray:
+         return "sg";
+      case GrayScale:
+         return "gs";
+      case TrueColor:
+         return "tc";
+      case DirectColor:
+         return "dc";
+      default:
+         return "";
+   }
+}
+
+static const char *
+visual_render_type_name(int type)
+{
+   switch (type) {
+      case GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT:
+         return "ufloat";
+      case GLX_RGBA_FLOAT_BIT_ARB:
+         return "float";
+      case GLX_RGBA_BIT:
+         return "rgba";
+      case GLX_COLOR_INDEX_BIT:
+         return "ci";
+      case GLX_RGBA_BIT | GLX_COLOR_INDEX_BIT:
+         return "rgba|ci";
+      default:
+         return "";
+   }
+}
+
+static const char *
+caveat_string(int caveat)
+{
+   switch (caveat) {
+#ifdef GLX_EXT_visual_rating
+      case GLX_SLOW_VISUAL_EXT:
+         return "Slow";
+      case GLX_NON_CONFORMANT_VISUAL_EXT:
+         return "Ncon";
+      case GLX_NONE_EXT:
+         /* fall-through */
+#endif
+      case 0:
+         /* fall-through */
+      default:
+         return "None";
+   }
+}
+
+
+static Bool
+get_visual_attribs(Display *dpy, XVisualInfo *vInfo,
+                   struct visual_attribs *attribs)
+{
+   const char *ext = glXQueryExtensionsString(dpy, vInfo->screen);
+   int rgba;
+
+   memset(attribs, 0, sizeof(struct visual_attribs));
+
+   attribs->id = vInfo->visualid;
+#if defined(__cplusplus) || defined(c_plusplus)
+   attribs->klass = vInfo->c_class;
+#else
+   attribs->klass = vInfo->class;
+#endif
+   attribs->depth = vInfo->depth;
+   attribs->redMask = vInfo->red_mask;
+   attribs->greenMask = vInfo->green_mask;
+   attribs->blueMask = vInfo->blue_mask;
+   attribs->colormapSize = vInfo->colormap_size;
+   attribs->bitsPerRGB = vInfo->bits_per_rgb;
+
+   if (glXGetConfig(dpy, vInfo, GLX_USE_GL, &attribs->supportsGL) != 0 ||
+       !attribs->supportsGL)
+      return False;
+   glXGetConfig(dpy, vInfo, GLX_BUFFER_SIZE, &attribs->bufferSize);
+   glXGetConfig(dpy, vInfo, GLX_LEVEL, &attribs->level);
+   glXGetConfig(dpy, vInfo, GLX_RGBA, &rgba);
+   if (rgba)
+      attribs->render_type = GLX_RGBA_BIT;
+   else
+      attribs->render_type = GLX_COLOR_INDEX_BIT;
+   
+   glXGetConfig(dpy, vInfo, GLX_DRAWABLE_TYPE, &attribs->drawableType);
+   glXGetConfig(dpy, vInfo, GLX_DOUBLEBUFFER, &attribs->doubleBuffer);
+   glXGetConfig(dpy, vInfo, GLX_STEREO, &attribs->stereo);
+   glXGetConfig(dpy, vInfo, GLX_AUX_BUFFERS, &attribs->auxBuffers);
+   glXGetConfig(dpy, vInfo, GLX_RED_SIZE, &attribs->redSize);
+   glXGetConfig(dpy, vInfo, GLX_GREEN_SIZE, &attribs->greenSize);
+   glXGetConfig(dpy, vInfo, GLX_BLUE_SIZE, &attribs->blueSize);
+   glXGetConfig(dpy, vInfo, GLX_ALPHA_SIZE, &attribs->alphaSize);
+   glXGetConfig(dpy, vInfo, GLX_DEPTH_SIZE, &attribs->depthSize);
+   glXGetConfig(dpy, vInfo, GLX_STENCIL_SIZE, &attribs->stencilSize);
+   glXGetConfig(dpy, vInfo, GLX_ACCUM_RED_SIZE, &attribs->accumRedSize);
+   glXGetConfig(dpy, vInfo, GLX_ACCUM_GREEN_SIZE, &attribs->accumGreenSize);
+   glXGetConfig(dpy, vInfo, GLX_ACCUM_BLUE_SIZE, &attribs->accumBlueSize);
+   glXGetConfig(dpy, vInfo, GLX_ACCUM_ALPHA_SIZE, &attribs->accumAlphaSize);
+
+   /* get transparent pixel stuff */
+   glXGetConfig(dpy, vInfo,GLX_TRANSPARENT_TYPE, &attribs->transparentType);
+   if (attribs->transparentType == GLX_TRANSPARENT_RGB) {
+     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_RED_VALUE, &attribs->transparentRedValue);
+     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_GREEN_VALUE, &attribs->transparentGreenValue);
+     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_BLUE_VALUE, &attribs->transparentBlueValue);
+     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_ALPHA_VALUE, &attribs->transparentAlphaValue);
+   }
+   else if (attribs->transparentType == GLX_TRANSPARENT_INDEX) {
+     glXGetConfig(dpy, vInfo, GLX_TRANSPARENT_INDEX_VALUE, &attribs->transparentIndexValue);
+   }
+
+   /* multisample attribs */
+#ifdef GLX_ARB_multisample
+   if (ext && strstr(ext, "GLX_ARB_multisample")) {
+      glXGetConfig(dpy, vInfo, GLX_SAMPLE_BUFFERS_ARB, &attribs->numMultisample);
+      glXGetConfig(dpy, vInfo, GLX_SAMPLES_ARB, &attribs->numSamples);
+   }
+#endif
+   else {
+      attribs->numSamples = 0;
+      attribs->numMultisample = 0;
+   }
+
+#if defined(GLX_EXT_visual_rating)
+   if (ext && strstr(ext, "GLX_EXT_visual_rating")) {
+      glXGetConfig(dpy, vInfo, GLX_VISUAL_CAVEAT_EXT, &attribs->visualCaveat);
+   }
+   else {
+      attribs->visualCaveat = GLX_NONE_EXT;
+   }
+#else
+   attribs->visualCaveat = 0;
+#endif
+
+#if defined(GLX_EXT_framebuffer_sRGB)
+   if (ext && strstr(ext, "GLX_EXT_framebuffer_sRGB")) {
+      glXGetConfig(dpy, vInfo, GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT, &attribs->srgb);
+   }
+#endif
+
+   return True;
+}
+
+#ifdef GLX_VERSION_1_3
+
+static int
+glx_token_to_visual_class(int visual_type)
+{
+   switch (visual_type) {
+   case GLX_TRUE_COLOR:
+      return TrueColor;
+   case GLX_DIRECT_COLOR:
+      return DirectColor;
+   case GLX_PSEUDO_COLOR:
+      return PseudoColor;
+   case GLX_STATIC_COLOR:
+      return StaticColor;
+   case GLX_GRAY_SCALE:
+      return GrayScale;
+   case GLX_STATIC_GRAY:
+      return StaticGray;
+   case GLX_NONE:
+   default:
+      return None;
+   }
+}
+
+static Bool
+get_fbconfig_attribs(Display *dpy, GLXFBConfig fbconfig,
+		     struct visual_attribs *attribs)
+{
+   const char *ext = glXQueryExtensionsString(dpy, 0);
+   int visual_type;
+   XVisualInfo *vInfo;
+
+   memset(attribs, 0, sizeof(struct visual_attribs));
+
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_FBCONFIG_ID, &attribs->id);
+
+   vInfo = glXGetVisualFromFBConfig(dpy, fbconfig);
+
+   if (vInfo != NULL) {
+      attribs->vis_id = vInfo->visualid;
+      attribs->depth = vInfo->depth;
+      attribs->redMask = vInfo->red_mask;
+      attribs->greenMask = vInfo->green_mask;
+      attribs->blueMask = vInfo->blue_mask;
+      attribs->colormapSize = vInfo->colormap_size;
+      attribs->bitsPerRGB = vInfo->bits_per_rgb;
+   }
+
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_X_VISUAL_TYPE, &visual_type);
+   attribs->klass = glx_token_to_visual_class(visual_type);
+
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_DRAWABLE_TYPE, &attribs->drawableType);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_BUFFER_SIZE, &attribs->bufferSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_LEVEL, &attribs->level);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_RENDER_TYPE, &attribs->render_type);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_DOUBLEBUFFER, &attribs->doubleBuffer);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_STEREO, &attribs->stereo);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_AUX_BUFFERS, &attribs->auxBuffers);
+
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_RED_SIZE, &attribs->redSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_GREEN_SIZE, &attribs->greenSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_BLUE_SIZE, &attribs->blueSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ALPHA_SIZE, &attribs->alphaSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_DEPTH_SIZE, &attribs->depthSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_STENCIL_SIZE, &attribs->stencilSize);
+
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_RED_SIZE, &attribs->accumRedSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_GREEN_SIZE, &attribs->accumGreenSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_BLUE_SIZE, &attribs->accumBlueSize);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_ACCUM_ALPHA_SIZE, &attribs->accumAlphaSize);
+
+   /* get transparent pixel stuff */
+   glXGetFBConfigAttrib(dpy, fbconfig,GLX_TRANSPARENT_TYPE, &attribs->transparentType);
+   if (attribs->transparentType == GLX_TRANSPARENT_RGB) {
+     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_RED_VALUE, &attribs->transparentRedValue);
+     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_GREEN_VALUE, &attribs->transparentGreenValue);
+     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_BLUE_VALUE, &attribs->transparentBlueValue);
+     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_ALPHA_VALUE, &attribs->transparentAlphaValue);
+   }
+   else if (attribs->transparentType == GLX_TRANSPARENT_INDEX) {
+     glXGetFBConfigAttrib(dpy, fbconfig, GLX_TRANSPARENT_INDEX_VALUE, &attribs->transparentIndexValue);
+   }
+
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_SAMPLE_BUFFERS, &attribs->numMultisample);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_SAMPLES, &attribs->numSamples);
+   glXGetFBConfigAttrib(dpy, fbconfig, GLX_CONFIG_CAVEAT, &attribs->visualCaveat);
+
+#if defined(GLX_NV_float_buffer)
+   if (ext && strstr(ext, "GLX_NV_float_buffer")) {
+      glXGetFBConfigAttrib(dpy, fbconfig, GLX_FLOAT_COMPONENTS_NV, &attribs->floatComponents);
+   }
+#endif
+#if defined(GLX_ARB_fbconfig_float)
+   if (ext && strstr(ext, "GLX_ARB_fbconfig_float")) {
+      if (attribs->render_type & GLX_RGBA_FLOAT_BIT_ARB) {
+         attribs->floatComponents = True;
+      }
+   }
+#endif
+#if defined(GLX_EXT_fbconfig_packed_float)
+   if (ext && strstr(ext, "GLX_EXT_fbconfig_packed_float")) {
+      if (attribs->render_type & GLX_RGBA_UNSIGNED_FLOAT_BIT_EXT) {
+         attribs->packedfloatComponents = True;
+      }
+   }
+#endif
+
+#if defined(GLX_EXT_framebuffer_sRGB)
+   if (ext && strstr(ext, "GLX_EXT_framebuffer_sRGB")) {
+      glXGetFBConfigAttrib(dpy, fbconfig, GLX_FRAMEBUFFER_SRGB_CAPABLE_EXT, &attribs->srgb);
+   }
+#endif
+   return True;
+}
+
+#endif
+
+
+
+static void
+print_visual_attribs_verbose(const struct visual_attribs *attribs,
+			     int fbconfigs)
+{
+   if (fbconfigs) {
+      printf("FBConfig ID: %x  Visual ID=%x  depth=%d  class=%s, type=%s\n",
+             attribs->id, attribs->vis_id, attribs->depth,
+             visual_class_name(attribs->klass),
+             visual_drawable_type(attribs->drawableType));
+   }
+   else {
+      printf("Visual ID: %x  depth=%d  class=%s, type=%s\n",
+	     attribs->id, attribs->depth, visual_class_name(attribs->klass),
+	     visual_drawable_type(attribs->drawableType));
+   }
+   printf("    bufferSize=%d level=%d renderType=%s doubleBuffer=%d stereo=%d\n",
+          attribs->bufferSize, attribs->level,
+	  visual_render_type_name(attribs->render_type),
+          attribs->doubleBuffer, attribs->stereo);
+   printf("    rgba: redSize=%d greenSize=%d blueSize=%d alphaSize=%d float=%c sRGB=%c\n",
+          attribs->redSize, attribs->greenSize,
+          attribs->blueSize, attribs->alphaSize,
+          attribs->packedfloatComponents ? 'P' : attribs->floatComponents ? 'Y' : 'N',
+          attribs->srgb ? 'Y' : 'N');
+   printf("    auxBuffers=%d depthSize=%d stencilSize=%d\n",
+          attribs->auxBuffers, attribs->depthSize, attribs->stencilSize);
+   printf("    accum: redSize=%d greenSize=%d blueSize=%d alphaSize=%d\n",
+          attribs->accumRedSize, attribs->accumGreenSize,
+          attribs->accumBlueSize, attribs->accumAlphaSize);
+   printf("    multiSample=%d  multiSampleBuffers=%d\n",
+          attribs->numSamples, attribs->numMultisample);
+#ifdef GLX_EXT_visual_rating
+   if (attribs->visualCaveat == GLX_NONE_EXT || attribs->visualCaveat == 0)
+      printf("    visualCaveat=None\n");
+   else if (attribs->visualCaveat == GLX_SLOW_VISUAL_EXT)
+      printf("    visualCaveat=Slow\n");
+   else if (attribs->visualCaveat == GLX_NON_CONFORMANT_VISUAL_EXT)
+      printf("    visualCaveat=Nonconformant\n");
+#endif
+   if (attribs->transparentType == GLX_NONE) {
+     printf("    Opaque.\n");
+   }
+   else if (attribs->transparentType == GLX_TRANSPARENT_RGB) {
+     printf("    Transparent RGB: Red=%d Green=%d Blue=%d Alpha=%d\n",attribs->transparentRedValue,attribs->transparentGreenValue,attribs->transparentBlueValue,attribs->transparentAlphaValue);
+   }
+   else if (attribs->transparentType == GLX_TRANSPARENT_INDEX) {
+     printf("    Transparent index=%d\n",attribs->transparentIndexValue);
+   }
+}
+
+
+static void
+print_visual_attribs_short_header(void)
+{
+ printf("    visual  x   bf lv rg d st  colorbuffer  sr ax dp st accumbuffer  ms  cav\n");
+ printf("  id dep cl sp  sz l  ci b ro  r  g  b  a F gb bf th cl  r  g  b  a ns b eat\n");
+ printf("----------------------------------------------------------------------------\n");
+}
+
+
+static void
+print_visual_attribs_short(const struct visual_attribs *attribs)
+{
+   const char *caveat = caveat_string(attribs->visualCaveat);
+
+   printf("0x%03x %2d %2s %2d %3d %2d %c%c %c %c  %2d %2d %2d %2d %c  %c %2d %2d %2d",
+          attribs->id,
+          attribs->depth,
+          visual_class_abbrev(attribs->klass),
+          attribs->transparentType != GLX_NONE,
+          attribs->bufferSize,
+          attribs->level,
+          (attribs->render_type & GLX_RGBA_BIT) ? 'r' : ' ',
+          (attribs->render_type & GLX_COLOR_INDEX_BIT) ? 'c' : ' ',
+          attribs->doubleBuffer ? 'y' : '.',
+          attribs->stereo ? 'y' : '.',
+          attribs->redSize, attribs->greenSize,
+          attribs->blueSize, attribs->alphaSize,
+          attribs->packedfloatComponents ? 'u' : attribs->floatComponents ? 'f' : '.',
+          attribs->srgb ? 's' : '.',
+          attribs->auxBuffers,
+          attribs->depthSize,
+          attribs->stencilSize
+          );
+
+   printf(" %2d %2d %2d %2d %2d %1d %s\n",
+          attribs->accumRedSize, attribs->accumGreenSize,
+          attribs->accumBlueSize, attribs->accumAlphaSize,
+          attribs->numSamples, attribs->numMultisample,
+          caveat
+          );
+}
+
+
+static void
+print_visual_attribs_long_header(void)
+{
+ printf("Vis   Vis   Visual Trans  buff lev render DB ste  r   g   b   a      s  aux dep ste  accum buffer   MS   MS         \n");
+ printf(" ID  Depth   Type  parent size el   type     reo sz  sz  sz  sz flt rgb buf th  ncl  r   g   b   a  num bufs caveats\n");
+ printf("--------------------------------------------------------------------------------------------------------------------\n");
+}
+
+
+static void
+print_visual_attribs_long(const struct visual_attribs *attribs)
+{
+   const char *caveat = caveat_string(attribs->visualCaveat);
+
+   printf("0x%3x %2d %-11s %2d    %3d %2d  %4s %3d %3d %3d %3d %3d %3d",
+          attribs->id,
+          attribs->depth,
+          visual_class_name(attribs->klass),
+          attribs->transparentType != GLX_NONE,
+          attribs->bufferSize,
+          attribs->level,
+          visual_render_type_name(attribs->render_type),
+          attribs->doubleBuffer,
+          attribs->stereo,
+          attribs->redSize, attribs->greenSize,
+          attribs->blueSize, attribs->alphaSize
+          );
+
+   printf("  %c   %c %3d %4d %2d %3d %3d %3d %3d  %2d  %2d %6s\n",
+          attribs->floatComponents ? 'f' : '.',
+          attribs->srgb ? 's' : '.',
+          attribs->auxBuffers,
+          attribs->depthSize,
+          attribs->stencilSize,
+          attribs->accumRedSize, attribs->accumGreenSize,
+          attribs->accumBlueSize, attribs->accumAlphaSize,
+          attribs->numSamples, attribs->numMultisample,
+          caveat
+          );
+}
+
+
+static void
+print_visual_info(Display *dpy, int scrnum, InfoMode mode)
+{
+   XVisualInfo theTemplate;
+   XVisualInfo *visuals;
+   int numVisuals, numGlxVisuals;
+   long mask;
+   int i;
+   struct visual_attribs attribs;
+
+   /* get list of all visuals on this screen */
+   theTemplate.screen = scrnum;
+   mask = VisualScreenMask;
+   visuals = XGetVisualInfo(dpy, mask, &theTemplate, &numVisuals);
+
+   numGlxVisuals = 0;
+   for (i = 0; i < numVisuals; i++) {
+      if (get_visual_attribs(dpy, &visuals[i], &attribs))
+	 numGlxVisuals++;
+   }
+
+   if (numGlxVisuals == 0)
+      return;
+
+   printf("%d GLX Visuals\n", numGlxVisuals);
+
+   if (mode == Normal)
+      print_visual_attribs_short_header();
+   else if (mode == Wide)
+      print_visual_attribs_long_header();
+
+   for (i = 0; i < numVisuals; i++) {
+      if (!get_visual_attribs(dpy, &visuals[i], &attribs))
+	 continue;
+
+      if (mode == Verbose)
+	 print_visual_attribs_verbose(&attribs, False);
+      else if (mode == Normal)
+         print_visual_attribs_short(&attribs);
+      else if (mode == Wide) 
+         print_visual_attribs_long(&attribs);
+   }
+   printf("\n");
+
+   XFree(visuals);
+}
+
+#ifdef GLX_VERSION_1_3
+
+static void
+print_fbconfig_info(Display *dpy, int scrnum, InfoMode mode)
+{
+   int numFBConfigs = 0;
+   struct visual_attribs attribs;
+   GLXFBConfig *fbconfigs;
+   int i;
+
+   /* get list of all fbconfigs on this screen */
+   fbconfigs = glXGetFBConfigs(dpy, scrnum, &numFBConfigs);
+
+   if (numFBConfigs == 0) {
+      XFree(fbconfigs);
+      return;
+   }
+
+   printf("%d GLXFBConfigs:\n", numFBConfigs);
+   if (mode == Normal)
+      print_visual_attribs_short_header();
+   else if (mode == Wide)
+      print_visual_attribs_long_header();
+
+   for (i = 0; i < numFBConfigs; i++) {
+      get_fbconfig_attribs(dpy, fbconfigs[i], &attribs);
+
+      if (mode == Verbose) 
+         print_visual_attribs_verbose(&attribs, True);
+      else if (mode == Normal)
+	 print_visual_attribs_short(&attribs);
+      else if (mode == Wide)
+         print_visual_attribs_long(&attribs);
+   }
+   printf("\n");
+
+   XFree(fbconfigs);
+}
+
+#endif
+
+/*
+ * Stand-alone Mesa doesn't really implement the GLX protocol so it
+ * doesn't really know the GLX attributes associated with an X visual.
+ * The first time a visual is presented to Mesa's pseudo-GLX it
+ * attaches ancilliary buffers to it (like depth and stencil).
+ * But that usually only works if glXChooseVisual is used.
+ * This function calls glXChooseVisual() to sort of "prime the pump"
+ * for Mesa's GLX so that the visuals that get reported actually
+ * reflect what applications will see.
+ * This has no effect when using true GLX.
+ */
+static void
+mesa_hack(Display *dpy, int scrnum)
+{
+   static int attribs[] = {
+      GLX_RGBA,
+      GLX_RED_SIZE, 1,
+      GLX_GREEN_SIZE, 1,
+      GLX_BLUE_SIZE, 1,
+      GLX_DEPTH_SIZE, 1,
+      GLX_STENCIL_SIZE, 1,
+      GLX_ACCUM_RED_SIZE, 1,
+      GLX_ACCUM_GREEN_SIZE, 1,
+      GLX_ACCUM_BLUE_SIZE, 1,
+      GLX_ACCUM_ALPHA_SIZE, 1,
+      GLX_DOUBLEBUFFER,
+      None
+   };
+   XVisualInfo *visinfo;
+
+   visinfo = glXChooseVisual(dpy, scrnum, attribs);
+   if (visinfo)
+      XFree(visinfo);
+}
+
+
+/*
+ * Examine all visuals to find the so-called best one.
+ * We prefer deepest RGBA buffer with depth, stencil and accum
+ * that has no caveats.
+ */
+static int
+find_best_visual(Display *dpy, int scrnum)
+{
+   XVisualInfo theTemplate;
+   XVisualInfo *visuals;
+   int numVisuals;
+   long mask;
+   int i;
+   struct visual_attribs bestVis;
+
+   /* get list of all visuals on this screen */
+   theTemplate.screen = scrnum;
+   mask = VisualScreenMask;
+   visuals = XGetVisualInfo(dpy, mask, &theTemplate, &numVisuals);
+
+   /* init bestVis with first visual info */
+   get_visual_attribs(dpy, &visuals[0], &bestVis);
+
+   /* try to find a "better" visual */
+   for (i = 1; i < numVisuals; i++) {
+      struct visual_attribs vis;
+
+      get_visual_attribs(dpy, &visuals[i], &vis);
+
+      /* always skip visuals with caveats */
+      if (vis.visualCaveat != GLX_NONE_EXT)
+         continue;
+
+      /* see if this vis is better than bestVis */
+      if ((!bestVis.supportsGL && vis.supportsGL) ||
+          (bestVis.visualCaveat != GLX_NONE_EXT) ||
+          (!(bestVis.render_type & GLX_RGBA_BIT) && (vis.render_type & GLX_RGBA_BIT)) ||
+          (!bestVis.doubleBuffer && vis.doubleBuffer) ||
+          (bestVis.redSize < vis.redSize) ||
+          (bestVis.greenSize < vis.greenSize) ||
+          (bestVis.blueSize < vis.blueSize) ||
+          (bestVis.alphaSize < vis.alphaSize) ||
+          (bestVis.depthSize < vis.depthSize) ||
+          (bestVis.stencilSize < vis.stencilSize) ||
+          (bestVis.accumRedSize < vis.accumRedSize)) {
+         /* found a better visual */
+         bestVis = vis;
+      }
+   }
+
+   XFree(visuals);
+
+   return bestVis.id;
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   Display *dpy;
+   int numScreens, scrnum;
+   struct options opts;
+   Bool coreWorked;
+
+   parse_args(argc, argv, &opts);
+
+   dpy = XOpenDisplay(opts.displayName);
+   if (!dpy) {
+      fprintf(stderr, "Error: unable to open display %s\n",
+              XDisplayName(opts.displayName));
+      return -1;
+   }
+
+   if (opts.findBest) {
+      int b;
+      mesa_hack(dpy, 0);
+      b = find_best_visual(dpy, 0);
+      printf("%d\n", b);
+   }
+   else {
+      numScreens = ScreenCount(dpy);
+      print_display_info(dpy);
+      for (scrnum = 0; scrnum < numScreens; scrnum++) {
+         mesa_hack(dpy, scrnum);
+         coreWorked = print_screen_info(dpy, scrnum, &opts,
+                                        True, False, opts.limits, False);
+         print_screen_info(dpy, scrnum, &opts, False, False,
+                           opts.limits, coreWorked);
+         print_screen_info(dpy, scrnum, &opts, False, True, False, True);
+
+         printf("\n");
+
+         if (opts.mode != Brief) {
+            print_visual_info(dpy, scrnum, opts.mode);
+#ifdef GLX_VERSION_1_3
+            print_fbconfig_info(dpy, scrnum, opts.mode);
+#endif
+         }
+
+         if (scrnum + 1 < numScreens)
+            printf("\n\n");
+      }
+   }
+
+   XCloseDisplay(dpy);
+
+   return 0;
+}
diff -Naurp mesa-20.2.1-orig/src/glx/xdemos/meson.build mesa-20.2.1/src/glx/xdemos/meson.build
--- mesa-20.2.1-orig/src/glx/xdemos/meson.build	1969-12-31 18:00:00.000000000 -0600
+++ mesa-20.2.1/src/glx/xdemos/meson.build	2020-10-15 23:07:14.486696790 -0500
@@ -0,0 +1,32 @@
+inc_xdemos = include_directories('.')
+
+glxinfo_files = files(
+  'glxinfo.c',
+  'glinfo_common.c',
+)
+
+x11_dep = dependency('x11', required: true)
+
+executable('glxinfo', glxinfo_files,
+  install : true,
+  #c_args : gl_lib_cargs,
+  link_args : [ld_args_bsymbolic, ld_args_gc_sections, extra_ld_args_libgl, '-lm'],
+  link_with : libgl,
+  include_directories : [ inc_src, inc_include, inc_mesa, inc_glx],
+  dependencies : [x11_dep]
+)
+
+executable('glxgears', 'glxgears.c',
+  install : true,
+  #c_args : gl_lib_cargs,
+  link_args : [ld_args_bsymbolic, ld_args_gc_sections, extra_ld_args_libgl, '-lm'],
+  link_with : libgl,
+  include_directories : [inc_src, inc_include, inc_mesa, inc_glx],
+  dependencies : [x11_dep]
+)
+
+man_dir = get_option('prefix') + '/share/man/man1'
+install_data(['glxinfo.1', 'glxgears.1'],
+             install_dir : man_dir
+)
+
